Where to find a custom playmat

I own Spheres of Influence, but want a larger board to accommodate the soldiers I replaced the cubes with. I would like to order a custom playmat with dimensions of 100cmx70cm. It can be slightly bigger or smaller than that, but it needs to be that 10 to 7 (10 to 6.8 would be even better) ratio.

I ordered through YourPlaymat, but they just kept giving me the runaround so I cancelled. Any suggestions?