You can buy replacement window kits, which would be all three entire panels (fabric and "glass"). You can buy individual side or rear panels directly from us, and some of our bigger retailers.
But because the "glass" is permanently installed (it's sewn and heat sealed) we don't sell just the "glass."
But the advice from Keebler about a boat canvas shop is good: several people have gotten good results going that direction. They won't be heat sealed, it may be a bit messy where they un-stitch things, but it may be a good price alternative.
The "glass" is clear vinyl, and a fairly standard item used on all sorts of tops for cars and boats,