If you know what you're doing, you can quickly find what you're looking for on eBay. Here are a few golden rules.

Be specific: If you're searching for the first edition of the original Harry Potter book, you'll get further searching for 'harry potter rowling philosopher's stone first edition' than you will searching for 'harry potter'. You'll get fewer results, but the ones you do get will be far more relevant.

Spell wrongly: It's a sad fact that many of the sellers on eBay just can't spell. Whatever you're looking for, try thinking of a few common misspellings - the chances are that fewer people will find these items, and so they will be cheaper.

Get a thesaurus: You should try to search for all the different words that someone might use to describe your item, for example searching for both 'TV' and 'television', or for 'phone', 'mobile' and 'cell phone'. Where you can, though, leave off the type of item altogether and search by things like brand and model.

Use the categories: Whenever you search, you'll notice a list of categories at the side of your search results. If you just searched for the name of a CD because you want to buy that CD, you should click the 'CDs' category to just look at results in that category. Why bother looking through a load of results that you don't care about?

Don't be afraid to browse: Once you've found the category that items you like seem to be in, why not click 'Browse' and take a look through the whole category? You might be surprised by what you find.

Few people realize just how powerful eBay's search engine is - a few symbols here and there and it'll work wonders for you.

Wildcard searches: You can put an asterisk (*) into a search phrase when you want to say 'anything can go here'. For example, if you wanted to search for a 1950s car, you could search for 'car 195*'. 195* will show results from any year in the 1950s.

In this order: If you put words in quotes ("") then the only results shown will be ones that have all of the words between the quote marks. For example, searching for "Lord of the Rings" won't give you any results that say, for example "Lord Robert Rings".

Exclude words: Put a minus, and then put any words in brackets that you don't want to appear in your search results. For example: "Pulp Fiction" -(poster,photo) will find items related to Pulp Fiction but not posters or photos.

Either/or: If you want to search for lots of words at once, just put them in brackets: the TV example from earlier could become '(TV,television)', which would find items with either word.

So once you've found your bargain item, bid for it and won it, what if it all goes wrong? Don't worry - eBay has a thorough dispute resolution procedure, and we'll cover it in some depth in the next article, so you'll be prepared if the worst happens.

EBay has quite an intricate and long-winded dispute resolution procedure. In this email, I'll try to break each step down for you, so you can see what's involved and how long it takes.

As an example, let's go through what you would do if you paid for an item but didn't receive it from the seller.

Before you open a dispute: Give the seller a chance to send the item before you get ahead of yourself and open a dispute. If you're concerned about how long the item is taking to arrive, the first thing you should do is send a polite email to the seller saying that you haven't received it and asking whether they have posted it. You should also check your own email address in eBay's options, to make sure that the seller can reply to you. As a last resort before opening a dispute, you should try to call the seller on the number eBay has for them. You might have to pay long-distance charges for the call, but that's better than dragging the auction through mediation for months.

Step 1 - You open an Item Not Received dispute: You can do this here: http://feedback.ebay.com/ws/eBayISAPI.dll?InrCreateDispute.

All you need to do is enter the item number and say that you did not receive the item.

Step 2 - eBay contacts the seller: eBay sends the seller an email that tells them that you've said you didn't receive the item. Then can then choose to tell you one of three things: that your payment hasn't cleared yet, that the item is in the post, or that they'll give you your money back. The seller can also tell eBay that they would like to send you a message.

Step 3 - You talk to the seller: You try to work out what's happened directly with the seller, sending messages back and forward. Hopefully they'll agree to give you a refund for the sake of their feedback, or your item will turn up in the post during this time.

Step 4 - Closing the dispute: After 30 days (or 10 days if the seller didn't respond), you have two options to close the dispute: either you were satisfied or you weren't. If you weren't satisfied, then you can claim under eBay's purchase protection program for up to $200.

Independent Dispute Mediation.

If you don't want to go through eBay's own process, and especially if the auction was for a high-value item, then you can use a third-party mediator. EBay recommend SquareTrade, at www.squaretrade.com, which provides mediation to many websites where there are buyers and sellers. They will contact the seller on your behalf and then mediate as you negotiate what to do from there.

Sellers who are committed to going through SquareTrade's mediation for any disputes can sign up to display the 'SquareTrade seal' on their auctions. This gives their buyers $250 fraud protection, and shows that their identity has been independently verified so they are who they say they are.

When your sellers aren't in such good standing, though, you need to be careful to avoid being a victim of fraud. There are a few scams that you especially need to look out for - we'll cover them in the next email.

There aren't that many scammers on eBay - but the ones there are tend to be greedy. This means that they will always try to pull their scams on high-value items like cars and computers, so that they can make a lot of money quickly. Since buyers generally buy these items very rarely, they may not know about the various scams out there.

Automobile Scams.

With cars, you will generally find that scammers try to get you to send them money in advance, for whatever reason. For some reason, some people aren't all that reluctant to pay 50% or 25% of the money before delivery using a relatively insecure payment method, especially on a car. They reason that the seller will obviously deliver it, as they'll want the other half of the money.

But there never was a car! Pictures of cars aren't hard to find, and the experienced scammers will have a whole library of pictures of different cars. The seller just got your $5,000 for nothing, and you can leave them all the negative feedback you like. They'll just go and open another eBay account and find their next sucker.

While it's not an outright scam, what you might find is that the car does turn up, but simply doesn't live up to the description - it has been oversold, in the tradition of used car dealers through the ages. If this happens to you then you should open an eBay dispute and say your item was not as described - you might get a partial refund.

Computer Scams.

If you bid in a computer auction but don't win, the seller might email you to ask whether you would like to buy a computer the same as the one they just sold through their own website.

This is a bad idea! You have no guarantee that the item will ever arrive, and you haven't just given them your money - you've given them your credit card details too.

There are sellers with nothing but positive feedback that use this scam often - and since you won't be able to leave them any feedback on the transaction, their reputation will stay that way. If you complain to eBay that you bought an item outside the site and got scammed, they will tell you to get lost and not do it again.

How to Beat the Scams.

There are lots of ways to beat the scams. First, whenever you buy anything expensive, be sure to check your seller's reputation thoroughly. Make sure they have sold items of a similar high value before, and haven't just sold a string of $10 items to get their feedback rating artificially high. If you want to be even more cautious, insist that the money is placed in an escrow service (eBay recommend escrow.com - don't use any other service unless you're sure of it).

To be honest, it's generally quite a bad idea to use eBay to buy things like cars and computers to begin with - you can get them anywhere, and the discounts aren't that big any more. It's better to use eBay for those rare, special things that you can't find anywhere else. The next email will give you some tips for buying collectibles.

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