Outdoors Wilderness Fabrics used to have some, they get different things all the time as does Rose City. The capillene is all sold out.
I make all my own chamois. I use the pattern that comes with stretch and sew, and I use ultrasuede and one or two layers or 200 fleece. Use butted seams. Seattle Fabircs offers a premade foam pad, but IMO it's nasty, I didn't like it at all. It felt like a cross between an oversize maxipad and a diaper. ;-(
Irulan
2015 Liv Intrigue 2
Pro Mongoose Titanium Singlespeed
2012 Trek Madone 4.6 Compact SRAM