I sure would like to use a commercial window ... one with the slide opening and a screen ..that would look Nice , just hard to justify the expense... It would appear that prices have increased considerably since the last time I bought some .. 4 years ago ..
So in keeping with the Thrifty Theme, guess building them would be the Thrifty alternative... Not like it's difficult to do ..
I did contact the old lady down the street with the abandoned Van (with windows)... she said she'd be glad to "sell" me some windows ... and I'd have to get them myself , which would require me to hire somebody with a tractor to haul it out of the intense overgrowth (snakes) ... What the heck , that's Not Thrifty , and for used windows ....grrrrrrrrrr!
However , I do have another plan ...

Got my friend who is a mechanic and has access to many things automotive at really good prices... He wants a foamie TD too (he's also the one who wants to sell them ) so we'll have to set him to task of finding some windows ... for a thrifty price. I'll tell him it's for his TD too ...
We'll have to see how it goes over at Vinney's today ... I know he has lots more of that Alaskan Cedar (like I used for my door frames) .. and HD is across the street ...

If he's not too busy , I can use his shop tools ... makes it EASY ...