I've bought pretty much all my clay from BITY. I've also started buying other materials as well. The owner - Mitch - is a great guy to speak with and 90% of the time when you call, he answers. His video tutorials are great and he has a great selection of tutorial DVDs as well. If all else fails - call him. He'll guide you through the newest materials and techniques for pretty much anything we can pull off in our shops and garages.