Do not have a die cutter...i wish :D I was told the 30mil outdoor vinyl will not work with a standard vinyl cutter as it will dull the blades (as mentioned). These magnets are going to be roughly 12"x18" so a die would be pretty pricey from what I looked at. I was told to ask around for someone who has a sampling press, but they seem to be rare or the people that have them want a huge quantity to even consider talking to you (jerks :P).
I'll look into that link though.