I would say imprintables warehouse, but your best bet is finding a Siser dealer. Just about all, if not all material they sell is Siser relabeled and a good portion of Stahls is the same. For everyday type of vinyl, I like the easyweed/Eco film. Really nice hand to hit. If you are doing Athletics, Thermo Film from stahls is the way to go. Wish I could cut their Premium plus? material (i think thats what its called) but I have the hardest time. As far as print/cut, I think its all Siser to be honest. Maybe 1 style here or there isn't but the bulk is. hope it helps
~Ryan