also try shopper.com and pricegrabber.com
don't JUST use pricewatch... it's good for some general components, but if you are looking for something more specific, use all three...
when i was looking around for cameras, pricewatch was no help, shopper.com was no help, i used pricegrabber all the way...
and as always, resellerratings is mandatory. (bizrate sucks).