This is the coolest art spot in San Francisco, and it's free! This is a space where artists with developmental disabilities create and exhibit their art. Their is a front room with books and postcards, and a back room where the artists work. You can also look through the work in the back as it available for purchase. They have parties every so often and the vibe is amazing. you get to mingle with the artists, see them at work, and sort through thousands of works layed out on walls and tables, all at great prices.

PROS: Not a snooty atmosphere and the art is unique and affordable
CONS: Not open on Sundays