What i always do to get a bargain on e-bay is:
1: find an item you like.
2: read the description carefully.
3:check out what other sellers are selling the item for on e-bay.
4:put your bid in.
5:say if the price is at $15 and you are willing to pay $50 for the item just put that in as a bid, this will be your maxium bid.
6: so if people bid it up to $49 you will still of got a bargain in your eyes.
7: if the item sells for more than you would of paid for it just check out other auctions for the item you want.
8: always watch a couple auctions of the item you desire, so if you get outbid you always have a backup auction.
9: never pay more than you want to.
10: most importantly, HAVE FUN ON E-BAY!