Honestly, I bought Kona PFD at my LQS and it was dirt cheap there -- like $4.95/yard (plus, my LQS gives me $1 off because I bought my machine from them). Depending on how much you need, this might be one of the rare instances where I would recommend buying it from LQS. I've never seen PFD at local JAF. They sell a 20yd bolt online, but I'd probably try a smaller amount first to make sure you like dying.