Save money, buy together!
Sometimes there's a game with an option to buy a 2/3/4-pack. These packs offer you a discount, but most of the time you don't have enough people to justify buying the pack. Do you need those extra people? Then this is the group for you! Find people here who want in on your 'Group Buy' and split the price with them.
Active group buys can be found under "Discussions"