I'm a nanotechnologist. Actually, I founded a graphene chip company that actually has a product and customers (Nanomedical Diagnostics).
There are two companies that already produce graphene roll to roll like this (Samsung and Grolltex). Not surprisingly, there's not much of a market for it. There are far fewer people working on graphene applications than on developing the raw material.
There are a few reasons for this. First, investment in commercialization of graphene applications is not popular (because market research is a necessary skill to pitch a product - not so much with a commodity). Second, devices and applications are just harder to make. Most people in my field don't want to work on the kinds of problems that are common in manufacturing (or if they do, they go work for Intel).
The result of all this is that it's actually very easy for someone like me to grow my own graphene (growth tech and know-how is cheap), and it's very hard for a graphene growth company to demonstrate applicability (meeting real industrial cost or QA targets).
In short, a third source of graphene of this type is not needed.