If you are looking for books, which is my favorite area, make sure and check out www.half.ebay.com. Everything there is at a fixed price, but they also let you know at the bottom who is selling and for how much on Ebay. I ALWAYS check around from half to ebay to amazon to see who has the cheapest used or new books but the ringer is always shipping. Sure it may be .01 on Amazon, but their shipping rates are higher than halfs so that .75 book might be the better deal.
I also hang out on Ebay A LOT. So if anyone ever has questions please feel free to ask for assistance. You would be amazed at what people fight over. I sell used wine corks for crafts that I get for free from the restaurant I work at. Then I turn around and buy cake pans and such. Well... at least they aren't costing too much:)
MAKE SURE TO CHECK FEEDBACK!!! Lately it seems I've been having problems with deadbeat sellers. If something isn't right and it's not being resloved file with Ebay ASAP! Too many of these fraudulent sellers know that after 60 days you have no recourse so keep on them about a resolution.