do any online vendors, shops, stores, etc. ever offer group buys? if you're not familiar with this process, a vendor offers a discounted price when a large group of people buy the same item. say the lowest price for a particular fork is $500. the vendor then offers the fork for $425 if 12 people commit to buying that fork. 12 people send in money, forks are sent out, group buy for that item ends.

I was curious since this practice is common place on automotive forums I belong to and great deals can be had on parts due to the bulk orders. seems like a good idea that could be transferred to bike parts, but I haven't seen it offered before.