It looks like all of the options posted here are much too big of companies to be interested in a group buy. We've spoken with Crucial, Intel, Samsung as well as a few of the others and unless we're buying 50,000+ units, the group's price won't be much better than what you can get out there. If anybody has other suggestions, just let us know and we'll look into it.
Samsung would never do a group-buy. They're too huge. And most other reputable SSD manufacturers are, too. Intel, Corsair, Crucial... they're all massive.