a group buy is when a bunch of people all agree to buy a product so that the vendor will agree to lower the price because of the big volume of sales he will get.
for instance lets say a product cost $200, if 5 people agree to buy he might let it go for $180, if 10 agree to buy, he might let it go for like $160 or so.
id be apart of a group buy if it were on a CAI or cams or maybe even suspension
Laly