most if not all places will only sell them in 2.0m widths.
I bought mine from The big green shed. Instead of running it width ways I ran it length ways and made it that way.
If not would two sections be useable for you?
I can tell you that using the right glue and straight edges you would be hard pressed to see any gap?
I use 3m contact cement I can't remember what number but it comes in a larger spray can, and it is designed for laminating.
I have been using it for years, and nothing, I mean NOTHING comes close to how well it sticks.
Cheers
Evo