I'm afraid I couldn't find any dealers with stock. It looks to be discontinued. I also couldn't find a used one either. The company at the following link can however rebuild the control for you. They do guarantee their work
I've been considering sending it to CoreCentric but I'm not sure it can be rebuilt. The back of the board is very burnt/blackened, and the smell, WOW! The other day when it went bad the whole house reeked of this aweful smell. I attached some pics of the board.