Running from 10 a.m. to 2 p.m. both days at 800 Alma St., the fair offers more than 30,000 used books for sale, with most costing $2 or less. On Sunday, the books will be half price or $5 for a full bag.
The books cover a wide range of subjects, including fiction, mystery, science fiction, romance, children's books, cookbooks, psychology, business, and computers.
The book fair will be held on the lawn at the main library at 800 Alma St., near the intersection of Ravenswood Avenue and Laurel Street in Menlo Park.
A sale of old and collectible volumes will be held during the book fair in the Menlo Park City Council Chambers. Prices there will range from $5 to $25.
All of the books on sale are donated to the library, and all proceeds go to support the programs and collections of the Menlo Park Library, including the Belle Haven branch.