The best site to check for good deals on stuff, all kinds of stuff, is dealsea:
http://www.dealsea.com/
If you would prefer to have only one deal each day, check out woot:
http://www.woot.com/
If you know what you want and you need to find the best price possible there are many sites that can help you accomplish this. Here are the sites that I use, in the order I would check them:
http://www.pricewatch.com/
http://www.pricegrabber.com/
http://www.bizrate.com/
http://www.shopzilla.com/
