I don't know if you guys have seen these but one of my local crew picked up the deep space mats and they are amazing.
They also sell a bunch of crater scape mats as well as basic stuff like dirt, fields, etc. What I like about it is that you can order them with a variety of differnt hex parrtterns, square, or plain with only the background art. The one we've been using for BFG is one of the blank mats.