Online History Of Computer Component Prices?

jtdubs asks: "I was pricing out computer components today and stumbled across an idea for a Web site. It would be nice to be able to query a database by product type (CPU, RAM) or brand (INTEL, AMD, Corsair) and be able to get graphs of each of their products and a graph of their respective prices over time. It could be helpful for determining when price drops will occur or for analyzing how new product releases affect pricing and would just be generally neat. Does anything like this exist already?"