That's my bad, I was trying to get everything typed up before heading out of the house and didn't end up being super clear. I'm not opposed to camper windows on principle or anything. Those round-cornered windows in SKIZO's gallery seem like they'd work great; certainly better than nothing. As somebody who's only concerned with budget and not quality, longevity, packaging, or ease of installation, what I'm really looking for is the absolute cheapest possible source for something like that.
Every time I find a discussion it's either "check out camper windows" (no links) or the links provided are either dead, stupid expensive, or usually sliders, which I don't need. On a quick google, I can turn up something like this, so the question is:
1: Is $150 the best I can do?
2: I hadn't even considered this before, but is 1-1/2" thick appropriate? Or should I target a different thickness if I can?
EDIT: I'm also turning up examples like this, which is dirt-cheap, but it's frosted privacy glass, so it's no good for visibility. But, it does make me think "I should be able to come up with what I want for pretty cheap, my google-fu is just too weak to find it." I'm hoping that maybe somebody else has been in my shoes before, and found the answer I'm looking for.
I had also considered backup cameras, and I think that even a few years later they were an option on the windowless vans! But, my goal is to be able to see behind me while driving forward, not just while parking/in reverse.
Retaining a company to customize something is certainly an option, but it doesn't seem like it would be the cheapest, which is really the hardest requirement of the project. If I reached out to a "local" company, for example, I live in what's become a stupidly-high-COL area. They would absolutely take me to the cleaners.