You can make a cutting mat yourself. Not sure how you'd make one that long-the only thing I can think of is cutting down a 12 x 24 cricut mat. Some people use that quilting plastic template material but I don't know if they make it that big-it might be worth checking out.
Wash: "A man walks down the street in that hat, people know he's not afraid of anything."
Jayne: "Da*n straight."
-- my recipes