I made my own too. I have a relative that worked at Pizza Hut some years ago and offered me one of the "peels" they used in the store, he took it for whatever reason and never had a use for it. I put "peels" in quotes because it wasn't a peel at all, it was one of the serving/cutting boards that they used for dine-in customers. It's about 18" in diameter (round) with a handle, and I'm not sure of the material, some kind of pressed fiberboard, which must have a coating since it's washable/cleanable without absorbing water. It's been used, and washed so many times during it's time in the restraunt, the surface is very smooth.
Anyway, not thinking it would work well, I at least wanted to try, since at the time I was using a flat (no walls) cookie sheet, which didn't work very well. I roughly shaped the "peel", trimmed off the sides and reshaped the front to a more flattened profile, reshaped the end by breaking the edges, etc.
It works awesome. It isn't pretty, and if I had known it was going to work so well, I would have put more time into trimming/shaping it, but I couldn't be more pleased. I'll snap a pic if anyone is interested.