Deep-Cut Studios have made up new larger mats for me. The new extra-large "Plains" design mat is just over 8' by 6' (2400mm by 1800mm approximate).
I also have one similar large Plains mat remaining, with a 15cm cross grid.
Deep-Cut mats are printed on a thin, light cloth which can be washed, ironed, and folded or rolled away for storage. Hills can be placed on top or even, if shallow, underneath. I regularly export worldwide. These mats (along with many other designs) can be found in the BigRedBatShop.