Mr. Dealio tracked the prices of electronics from Best Buy and Circuit City to find out who drives the competition for better deals:

In the online retail world, few competitors are as fierce as Best Buy and Circuit City. When asked, most people have a preference toward one -- or avoid them all together. We thought it would be interesting to study the historic price performance of these two heavyweights across several products to find out who really gives consumers a better deal.

Link - Thanks Nick!