As a reply to Hugh Sakois.. take a look at the Esterly mat cutter.
There's one up on eBay right now for $899.
http://www.speed-mat.comThis is a wall mounted cutter that also sizes foamcore, and glass and has the capability to make double mats as well.
As for the OP, the best bet is to just go to a local framer who can cut anything you will ever need.
Yes, at some point, you need to bite the bullet and buy your own mat cutter.
Of course, you could go all the way and buy a computer controlled mat cutter for a mere $20,000 or so!!