Where to get the Stuff you need
Great Lakes Lithics, 3168 West Shore Drive, Battle Creek MI 49017
Frank has a really nice selection of fancy heat treated slabs, including  Brazil Agates, India Agates and Jaspers, and Flint Ridge. He also carries a wide selection of Flintknapping tools.
Steve Behrnes, 11212 Hooper Road, Baton Rouge, LA 70818
Steve has a large selection of Obsidian, Dacite, and Heat Treated Texas material. He also specializes in kilns for the Flintknapping enthusiast.
Barbara Cashman, Glastile. 1109 Coliseum Blvd, Greensboro NC 27403   PH: 336-292-3756
Barbara has some of the nicest glass that I've ever seen. She has Carrera, Vitrolite, and fused glass made to your order. Various thicknessness up to and including 1/4-3/8 inch.
Tim Mayeux, 349 Brown's Bend Road, Alexandria, LA  71303
Tim has a nice selection of quality heat treated Texas Slabbed material and some exotic stones and glass. Also, tools and materials for pressure flaking and notching.