I think the last vinyl and blades I bought were from signsupply.com, but I will have to check to make usre. You can also find the vinyl on E-bay. The 60 degree knife blade is the one I was told to use if cutting Monokote, I have one but have not tried it yet. You can buy 12 inch wide rolls of vinyl, but another option is to find a local sign shop which will give you their scraps (sometimes free), and this stuff makes a good masking material. The 3 year vinyl I use for my marking, last longer than most of my planes...:-)
TOmmy