Mpire.com
This is a shopping search engine on steroids. Not only will it give
you a list of links to where to buy that 32-in. LCD TV, if you click
on Show Product Details, it will display a pricing chart that shows
whether the price is trending up or down, at both retail and at
auction, so you can decide if it's the right time to buy. (Farecast does the chart thing with airfares.) The "shopping companion"
browser plug-in, a free download, is handy to use when you are
shopping at other sites; it shows what other etailers are charging for
the item you're looking at, so you can be sure to get the best deal.
Soon it will also show how consumers rated the product on Epinions and
Amazon. Another shopping search engine worth trying: TheFind.com. So far this site has indexed
more than 150 million products offered by 55,000 online stores, from
mom-and-pop Web shops to major e-tailers like Amazon.com, and it
doesn't accept payment from merchants for top placement in its search
results.