The Friends of the Arlington Heights Memorial Library is a not-for-profit organization that raises funds to provide programs, materials, equipment, and artwork for the library. The Friends sponsor four yearly used book sales and have donated over $1,000,000 in purchases to the library since the group's formation in 1969.
The Friends' Book Boutique offers used books and magazines for sale throughout the year. It is located on the first level near the Welcome Desk.