Eastwood Co. - Has inexpensive kits up to professional grade tools, and supplies. Mostly automotive oriented, but I use the small kit for coating project boxes and mounting brackets. You just need their kit and a toaster oven. Any electric oven would work, but don't use one you cook food in.

Smooth-On - Supplies for starters to professionals. Pint size to multi-gallon. I've used OOMOO-25, a great starter kit, ready in about an hour.