I buy on eBay a lot, and while bad things happen they don't happen often and are usually a product of a misunderstanding, not a scam.
lonesoldier said:
1) Fraud: I'll pay them and my books never arrive, or I get books that are not as advertised (poor-condition, wrong book, etc). Do I have any method of recourse?
1) If you use PayPal you can take it up with them. They can sometimes get you your money back. If they can't help you then eBay might. Read their policies on their sites.
I've been using eBay for probably 8 years now. I've only had bad transactions three times, and all of them worked out in the end.
lonesoldier said:
2) Seems a little too good to be true. New condition Eberron campaign setting for $10? That sells in local stores for around 45 CAD...
2) Auction prices often go up at the last minute. Also, watch for price gouging in the shipping cost. It's standard practice on eBay to inflate the shipping costs (which the buyer usually pays) to make a few extra bucks. Adjust your bid for the extra shipping cost.
Some tips about new buyers:
1) Don't buy from people with low amounts of feedback. As a rule, I don't buy stuff from people with a score lower than 10. If they have bad feedback, scan through the feedback for the bad ones and see who left it and why. Most of the time it's somebody who didn't read the auction and is just upset that they got an item they didn't expect.
2) Read the auctions carefully. Don't get caught by surprise by the amount of shipping (see above). Look at the pictures. Ask questions to the seller if something isn't clear. Don't bid on something unless you're comfortable with the amount of info you have about it.
3) A common practice on eBay is to wait until the last minute to bid in order to "beat the other bidders." This can lead to bidding wars, with people upping their bid once every five seconds in the last minute of the auction. I don't like to do this because I find I spend more than I want to, and there are usually plenty of other similar items to bid on. My strategy is to decide how much I want to pay for this item and bid that amount (minus shipping costs). If I get overbid I move on to the next like item. It takes longer, and you may come to a point where you realize the amount you're willing to pay is not enough to get you an item, but you won't find yourself paying $100 for a $25 item because you got caught up in a bid war.