Not in Oakland, but in SF...Satin Moon Fabrics is one of my all time favorite stores.
http://www.yelp.com/biz/satin-moon-f...-san-francisco There are some quilting fabrics there, but there's also all kinds of other fabrics too. It's not cheap, but the selection is just exquisite. Plus, Clement St. is a great place for Asian food and markets. Be sure to check their hours before you go.
~ C