We have a real nice, open-able 6ft x 2ft skylight that was removed from our house during a re-roof, so that we can have more room for solar panels. The double-paned glass and aluminum frame are completely intact, and it even has a crank and removable screen. We asked the roofers to remove it carefully to save it, because we figured it would make a nice cold frame. However, we soon realized that we don't have room to add a cold frame this big.
It's on our deck right now, but needs to go to someone with more room in their yard/farm/nursery/demo garden than we do, so if you're interested let me know asap by replying to email@example.com