Source
From the update:
Richard Hale from Battleboards.UK has come up with a more affordable way to make the fabric maps with rubber backing, so we will work with him and do a short run for the Kickstarter, to "test the waters" as it were. If this is a popular item, we may make more types of them. The rewards will be $56 + $10 international shipping. These are really big and fairly heavy and must be shipped in a mailing tube, separately from any other items in a box, hence the additional shipping factored in.