I bought mine at Overtons, I beleive for all 3 boats I have replaced it on. I am a little disappointed with the stuff I most recently bought for the 175 because it is so thin. On the other hand, if its too thick, it would lay over contours very well.
I did check out Corinthian and its nice stuff but I would have had a lot of waste due to the sizes they sell. This stuff will do for now.