Jigsaw Puzzles
Some libraries sponsor puzzle exchanges, so you can trade your old puzzles for new ones. If you live near the Cedar Grove Public Library in Wisconsin, you are all set! Stroll down there and puzzle swap! Otherwise, check with your local library.
If you have vintage puzzles made out of wood, there are many collectors out there who will purchase them, such as Bob Armstrong in Worcester, Massachusetts.
The British Jigsaw Puzzle Library in Kent, England, would love to receive donations of collectible old puzzles.