I've been organizing spring and summer group buys for our local Mid-Atlantic forum gardeners... but I don't ship; repacking for pickup is as much as I want to handle.
I've gotten spoiled with wholesale pricing, but I still get "special" bulbs from B&B or VE. For anybody interested in hosting a group bulb buy, I wrote a couple of articles over on DG with lots of tips. We have a "system" for packing orders that works really well.