Alot of profesional shops charge $150+ if you do a good enuff job i don't think $75.00 is a bad price to start at. Work your way up from there. I mean it sounds like you have roughly 42bux invested in it. You could profit 33 bux per mat or if you did $100.00 per mat you could make 58.00+ profit.

Either way if your going to start making them make it worth your time.