Pricewatch Video Cards. Here's an easy way to see the prices of video cards at a glance. Pricewatch publishes them all on one page. The pricegrabber merchants seem higher end (fewer small stores), but this is a great way to get a feel for market pricing.
"Pricewatch on CPUs":http://www.pricewatch.com/menus/m3.htm. The same is true for CPU pricing. A good display here showing the pricing cascade.