Kevlar

What is a good place online to buy plain weave kevlar for reinforcing the backside of the parts i make?

I would like a flat weave no thicker than .012" preferably. Best price by the yard, where?

I’m also looking for some Hexcell Plain Weave Fiberglass cloth, 18oz style #7544 i believe. Anyone got excess they want to sell?

I use 7544. I get it from AVT.