www.mdpsupplies.co.uk is where i brought mine from.
I have a vinyl cutter as well and its where i buy graphic vinyl from not had a problem with the service and quality.
I have the gloss black roof vinyl sitting in my room waiting to go on, need it to be about 15 degrees though otherwise it might shatter well thats what I have been told
just make sure it is a cast wrapping film if your doing anything with any sort of curve to it or recess.
if its called a wrapping film its likely to be a cast neway but i would make sure you see/hear the word cast, anything other than cast is not designed for stretching/heating for long term graphics.Cast wrap? From watching the YouTube vids, any wrap, once heated, can be used on curves