Surprised JoAnn's didn't have it...
All of the "craft" type stores around here have it. Ben Franklin's, Michael's, Banner Crafts, etc. If you have a craft store around, check them out.
Also all the outfitter stores around here have it. Not just the big names like REI, but there are a few mom-n-pop stores like Sherper's.
Otherwise, yeah just contact Paul, he's a great guy and I'm sure he could get you some sent off pretty quick.
Look forward to seeing what you construct!