When buying an item on ebay, I have found the best way to ensure you get a good deal is to do the following:
1.Put the item of interest into your "watched items" box.
2.Ask the seller any relevant questions you may have about the item before bidding.
3.Wait until close to the end time of the auction before placing a bid.
4.Make the bid up to the maximum you are prepared to spend. You don't want to lose out over a lousy 50c!
5.If you are the successful bidder make contact with the seller immediately. Complete the checkout process as soon as possible after the close of the auction. Sellers appreciate prompt communication from buyers.
6.If you follow the above, you should get positive feedback from sellers, and you also receive your item sooner!
Hope this helps and have fun shopping on Ebay!