Peapod Fabrics carries the adorable type of prints you'll find on sites like Repro Depot, but if you're local to San Francisco or the Bay Area, it's quite nice to be able to browse and purchase in person. In addition to regular yardage, they also offer most of the fabrics as $2 fabric squares.
Even if you don't already sew, a visit to the adorably cute Peapod is certainly enough to get you crafting in some way.
1314 18th Avenue
San Francisco, CA 94122