I have an ancient plastic Tupperware mat, about 16x24", that I consider a baking prep mat - used to roll out dough for pie crust, cookies, etc. (It's not oven-proof and therefore not a true baking mat.) Unfortunately, it's falling apart and I need to replace it, but Tupperware seems not to sell this product any longer, and I'm not sure who else might. Any suggestions? I mostly use my mat for pizza dough and the occasional batch of cookies or jelly roll, not pastry, so it doesn't need to be anything fancy.