Many museums, especially children's museums, like to include books in their exhibit areas. One difficulty with providing visitors with subject-related materials to enjoy during their visits is stretching the already tight exhibit supplies budgets to make this happen.
PaperBackSwap.com is one website that lets you "swap" existing books to gain points to exchange for books on the site. They have many types of books (not just paperbacks!)on a variety of topics including science, history, technology, etc. So clean out your old books to get some to use in your exhibit galleries! I like the idea and have happily used the PBSwap website. It's worth checking out.
In a similar way, I wonder if there is a way to "repurpose" surplus exhibit materials or devices between museums. We tried to start up such an exhibits exchange several years ago via ASTC, but it sort of petered out.
I wonder if now that we are in the brave new era of "Museum 2.0" (Hi Nina!) there might be a way to "swap" exhibit materials that weren't being used at one museum to another interested institution.
If anyone would like to help start something like this up, let me know!