Paper Terrain is something that I like in that you can get a nice looking table without much expense. It tends to be used more in the RPG environment, but there are a lot of people that have made good use of it in wargames too. Black Scrolls Games is another company that makes Paper Terrain Models and STL Files for 3D Printers.

If you like their stuff, remember that you can help support Must Contain Minis by buying it from DriveThruRPG by going to the webstore off a link from this site.