I've been thinking about a group buy also, but after seeing Brewmaster's Warehouse prices, I doubt I'd save that much money. I don't work for them or anything, it's just where I've always bought my recipes.
I think they quoted me $46 for 50lb Briess 2-row. And they'll mill it for you too. Just bring a container.
Of course, this isn't for sale on their website otherwise they'd have to ship it for their $6.99 flat rate.