I hit the mother load!
I was checking out our local on-line classified ads yesterday when I came across an ad that advertised 100 sheets of 1/4" thick glass that was 34" wide by 72" long. Well, I thought this would be just right for the greenhouse that I want to build. I called the number today and found out that it originally was a greenhouse that the guy didn't want anymore and he took it down. WOOHOO! I got to call the guy Saturday before I go to make sure that there is any left. I'm hoping for 20-30 sheets. I'm planning a 12x20' greenhouse but that plan might grow before I build it.
The best part. It's free!