I buy most of my materials from
Sign Outlet Store in Illinois. I do buy some stuff from Fellers too because they are closer, but my laminate comes from signoutlet. They charge me $1 per cut so really insignificant. I've never had an issue with cutting down the material itself. The only time I run into a problem is if the laminate runs over half of my registration mark, the graphtec gets confused. Sometimes I have to carefully cut out the laminate that is on the reg mark for it to read properly.
I really just find it much easier to do it this way then trying to unroll to remove the craft
paper, then re-roll to put in the vinyl cutter. I only need to spend $1 and it saves me the hassle and it keeps me from needing to buy and stock craft
paper.