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Into sewing? Here's a giant map of secondhand fabric stores by city! (USA & Canada)
(www.sewingthroughfog.com)
A place to share ideas, knowledge and creations with textiles. The focus is on reducing waste, whether that be sewing from the scraps left from other projects, using the end of rolls and remnants, or repairing and remaking finished pieces.
Not sure about all of these, but Upcycle Creative Reuse in Washington, DC takes donations. I've gotten some good deals there. A lot of the fabric and notions are unused from personal stashes or business overstock. They also have a ton of general crafting supplies.