I'm excited to get to mod the new Co-ops board, as well as organizing and participating in the co-ops.
Gossamer gave a great explanation of co-ops. "Group buy" is another term for it. All the information for the co-ops will be hosted in a co-op-specific thread here in the Co-ops forum, where members can post to participate, add their orders, ask questions of the organizer, etc. (Non "official" co-op business goes here, in the Co-op Chat forum.) All payments will go to the organizer, who will deal directly with the manufacturer to place the order and submit one payment for the whole thing. The order ships to the organizer, who sorts it out into individual orders, packs them up, and gets everyone their shipping totals. Once shipping totals are paid, orders are shipped to participants who get to enjoy their lovely goods!
We are accepting organizer applications now, so go ahead and get those in if you want to run a co-op!