Raven at StudentDump has posted a message on tips for buying and selling in ebay. Those 15 tips should help you some ways or the other. Tips like this is very useful:
Offering To Close Early
A nifty way to save cash on items is by offering sellers an end bid early option. The key here is that you will have to find recently listed item (less then 100 views) and from sellers with fewer than 50 feedbacks. Try to keep your initial offer to no lower then 10% of the regular Ebay price, do an Ebay ended items only search and take the average of last 10 items to get the latest going rate for that item.