Ok; this is a long shot but here goes.
A friend of mine had a custom car that he was finishing up. It needed a new window in the back but he could not find one for this car and he did not want Lexan or anything like that. It was curved glass so a flat piece would not fit.
I was over at his house and he was telling me his troubles. He also had his Olds mini van parked out in front. I looked at the windshield on the mini van and said, "hey, that glass looks about like the curve you need on your car." He said, darned if it doesn't.
We made a template out of cardboard and matched it up. Exact curve he wanted and needed; the piece of glass was just too big.
He called around and found a place that could water jet cut glass. The only problem was it was on you if they broke it. You had to pay the cost of the cutting. $300.00 bucks or something like that IIRC?
He went to a wrecking yard and pulled a piece of glass out and tried it. They broke it. :M $400.00 bucks down the tubes. :R
He did it again and it worked this time. We installed the glass in his car and never looked back.
You might give something like this a try. I would also fit within your price.
Good luck and let us know how this turns out.
~ Too many freaks & not enough circuses ~
"Life is not tried ~ it is merely survived ~ if you're standing
outside the fire"
"The best way to get a bad law repealed is to enforce it strictly."- Abraham Lincoln