The Friends of the El Sobrante Library accept donations of used books, and sell them at monthly sales. All proceeds from sales and gifts to the Friends go to support Library programs. Sales are held on the first Saturday of the month, except when the first Saturday is a holiday. Memberships are sold at the door. Members may enter from 10 am – 12 pm, and the general public is welcome between 12 noon and 2 pm. There is a donations bin in the Library near the Meeting Room.