Pricegrabber.com
Online comparison of web merchants. If there is a certain product, simply type in the search box what you are looking for and if there is a merchant (or several merchants) offering the same product, you can compare the best prices. Works best with big, name brand items. Also, you save a hell of a lot more than buying from a traditional brick and mortar corporate business.
Shopping.com
Pretty much the same as Pricegrabber.com (but it's always best to use 2 or more sites to make sure you are getting the best deals across the web). Also, some comparison sites have slightly more listings and other options than their competitors.
Bizrate.com
Who says there can't be 3 similar sites? After all, we got Yahoo!, Google, and Microsoft's MSN. Not to mention... Dogpile, Ask.com (or previously Askjeeves.com), among others.
Craigslist.com
Local classifieds website. Not a bad idea if you can find a deal around your area.
MPire.com
See the current trend and prices before you commit to any payment.
Ebay.com
Online auction site normally has one of the lowest prices and bargain hunters. Widest selection. You can almost find anything here, including big name and rare and collectible items.
Google Base
Trust me, in the future... You will probably turn to this first. Compiles a huge directory of many small online stores as well as big name websites. Consider it Google's work-in-progress and future largest web shopping directory.
Yahoo! Shopping
It's up there... among the top online web shopping portals.
Amazon.com
Not just a book retailer, this online site has plenty of sellers and the best discounts on reading materials... period.
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OnMyList
List your pants off!