- Steven Harris has a book, Sunshine to Dollars, that talks about how to get free windows.
- Jack also had a guest that built his own attached greenhouse for less than $100 (Maybe it was Harris, but my memory is bad). He got the glass by going to glass and window making companies and getting their rejects and extras. He said the key was being friendly and bring over pizza and beer whenever he went over there for a pickup (so not really free, but still cheap). I can't remember the show that was on.
- Habitat for Humanity runs Restore shops that have construction leftovers. I have gotten some cheap stuff there, but have never priced any windows.