Since no one else chimed in, I'll step up. This is the only thing I can think of. Los Angeles is driving distance for you, right, T.?
I love Michael Levine's in downtown Los Angeles (garment district). Big ole fabric store in two buildings (regular and upholstery). There are also tons of fabric stores in the vicinity, but Michael Levine's is actually a regular fabric store so might have more of a selection.
Worth a call anyway to see if they have it. Their selection is huge. I must never go there with Masouma again. Too dangerous.
http://www.mlfabric.com/