Hi Chris, welcome to FiberglassRV
Glass is replaceable. Did you lose any part of the frame? If all you need is glass, take the whole frame to a glass shop. I've replaced the glass in the door window of my Scamp
and it cost me around $20.
If the portion of the frame holding the glass is missing, you may find it cheaper to buy a whole new assembly. Scamp
about as cheap as you'll find. You'll need measurements! And be sure to call, rather than the e-mail addy for the parts department. But be aware, shipping a "glass" product isn't the cheapest thing in the world.