Fabric Source in DC/NOVA

Oh, Lord, now y’all have got me started.

In this post: http://boards.straightdope.com/sdmb/showpost.php?p=14282089&postcount=68 our own Ms. Battye describes the perfect fabric store.

Does anyobody know of one in my area? Decidedly not looking for the local overpriced retail shop here, no matter how nice the ladies are. I’m cheap, and I have a taste for fine textiles, so I’m looking for the place that’s in the back of the industrial park and is not to be found in the phone book.

Feel free to include your own as well.

G Street Fabrics