One of the things I love most about the Net is the growth of useful communities. One such community is dealmac, a site which provides the latest information on the best prices for Macintosh related items. These prices are often submitted by community members, who happened to stumble upon a good deal, and want to spread the word.
The site provides a wealth of tools as well, including e-mail alerts tailored to your needs, and RSS feeds of the latest products added to the site.