No price is listed, only says they are "available" (not "sitting on my shelf and waiting to be shipped). Someone would be taking a huge risk buying these in bulk for a group buy. If they were not paid for up front by participants in the GB the GB organizer could end up with a garage full of overpriced mags if a ban were not to happen. May be a great opportunity but that is my first reaction.
I would only buy USGI NIW when pricing was around $6-$8 each shipped. I bought a ton of them from from Detroit Tackleberry.
Used mags @ gun shows never more than $5 each.