I'm planning on replacing mine within the next month or so. Unfortunatley like others have said I think Carmotorsports is the only option.
A while back I ordered a "stock" TTA insulator on ebay. Said it was in awesome condition and from a car with like 5k miles on it. There werent' any pictures in the auction but the seller assured me that it was in pristine shape, with no stains or anything on it. I ended up winning the auction for like $30 plus shipping. A couple weeks later I recieve the package and open it up to not only find it creased in half which caused a tear in the material, but it wasn't even a TTA insulator and it looked worse than the one that I already have (has a bunch of whitish stains on it).