i think this site needs a price listing section so we can find the cheapest prices on aftermarket materials.

You mean have prices associated with parts in the database? If so, that idea does not work very well, because of a few reasons. Prices are always changing, and it'd be an incredibly high amount of work to constantly update all the prices on the parts. Plus, if users are allowed to submit prices and the website where the part is available at, then I'm sure that companies will register and abuse the system. Plus companies might stop carrying the parts, but chances are that the site would not be updated to reflect this.