I bought my 48 x 96 self healing mat at this site.....
http://www.speedpress.com/cuttingmat...Fe5AMgodKWsA4g
It has marking on both sides. One side is black and the other side is green. Have not had any issues with it and its been a couple years since I purchased it. I made my cutting table to fit the size mat I could find instead of the other way around.