What would these window installers do with the old windows that were taken out of houses? Are they just thrown away? Is that possible to get them from a restoration firm for free?
go and ask one of the firms Joshua, but I would expect so. Try a small firm where you can speak to the boss.
My mate owns a window company and he is always happy to doll out old windows as it saves on scrap costs! My new cold frame is being built courtesy of him
Look on Freecycle.