If you like to get some good deals this is a good way to get them. It adds a little bit of excitement to buying products. I have bid on items at these sites but I have had the best luck on the UBID site. I have found that the best way to bid, is to bid on an item as soon as they put it up for auction. If you do this you will be moved ahead of all the other people bidding the same price, since you bid on the item first. try it out I have found it to be fun.
EGGHEAD - http://www.surplusauction.com/ Lots to bid on.
EBAY - http://www.ebay.com/ Their stock prices are high, but I have not bid here.
ONSALE - http://www.onsale.com/ Has been advertising a lot on ZDTV lately.