I love using Longfieldgardens. They give good discounts for larger orders and often throw in bonus bulbs and always give free shipping. I have never ever been disappointed with anything I've gotten from them and they are a joy to work with. I've never done a group buy with them I just let people know I'm ordering from them and if they want to get in on my order that's fine, I'm usually ordering enough to get the free shipping anyway. Check them out, the first order is always something like 20% off the entire order.