Google greenhouse window
and you'll find a ton of sites. I didn't check any prices, but about 10 or 15 years ago, I priced one for my kitchen. It was going to be quite expensive, but the window is 10' long x 5' high.
I didn't have the money back then, but now that you've reminded me, I may have one installed this year.
(Especially since my neighbor to the south is, at this very moment, putting a second story on his garage, which is 5' from our mutual property line. The building will effectively block the best plant window I have.
What are the permit requirements in your jurisdiction (county / city)? Some jurisdictions require height limits within X feet of a property line, etc. DH and I were able to have a neighbor's project scaled back some years ago (5-foot lot line there, too) when he was going to build a 2-story building 10 feet from our house. He violated the % development limit on lots with his square footage--something the Planning Commission had (somehow?) overlooked.
We would never have known about this % limit if I hadn't requested my own copy of the building permit requirements. They were a !@#$%^ to read through, even for me (used to tedious reading as I am..., due to my work), but they saved the day. Or at least part of it....
And to the OP: do you mean greenhouse windows? Or are these cold-frame windows?
Sunset Zone 17, USDA Zone 9