For a long time, I used a large black section of felt that overlapped a 4' x 8' table. Used the tooth brush method to sprinkle on a mix of white and yellow stars, I could vacuum it with a DustBuster, and it rolled up nicely for storage when I wanted to use my game table for other things. Later, I got 2 sheets of 3' x 4' plexiglass from a hardware store, sponged on a few red/blue nebulae and toothbrushed on stars to one side, then sprayed over that with matte black before adding a gloss seal cost to it. Added lots of felt feet to that side, flipped it over and had a gorgeous space board for about $40 total, including spray cans. The only problem with that one was it was VERY reflective. Ships and tokens stood out well against it, but it was difficult to photograph well.