Where to buy hard wool felt for a paddle strop?

I would like to make a paddle strop with wool felt but can't find anywhere when I try and google it. Does anyone know where you can get a sheet or strip of this stuff?

Here is where I got mine. Keep in mind this is the highest grade and VERY hard. They have cheaper, less dense ones too. I purchased a 12x12 piece and cut my own and glued it to wood. In hind sight I would just leave it loose so you. An use both sides.

http://www.durofelt.com/image_21.html

Exactly what I was looking for, thanks Kentos!

Automotive upolstry shops have tons of it.