I'll just use a 4' x 6' and ensure the players measure up properly to begin with the official size of the board.
I agree with OP, it's a bit frustrating, and there are dozens of cool designs from other companies in 4' x 6'. Those selections are going to be picked up by the couple of players we have, or they will just use one of mine.
I would of bought a cool 3' x 6' from FFG. Their mat quality is quite good.
Edited by Shrapnelsmilespelling