For Epic Casual, something similar to this ...
What does everyone use to play on?
Our kitchen table is big enough for a nice 1v1 match. The standard mat fits with inches to spare on either edge, and there is plenty of room on the sides for boxes, cards, tokens, and whatnot. For Epic we move into the dining room.
At one of the game stores I go to we push two standard folding tables together and put a 3x3 piece of wood on them to bridge the gap and make for a smooth surface for the mat. At another store they use only one table but the same wood concept; I'm a bit less certain about that setup since the wood overhangs the edges of the table, making it susceptible to being bumped, but it seems to work okay and takes less table space...
A friend of mine got a discount yoga mat that he cut down, taped together and then I imitated. Works great on any surface 3x3 or bigger.
We use an acrylic covered pool table. It's plenty big enough for legion, armada, and 2 separate games of x wing.
At home it's just the small table for my kid in the living room when we play. A second one suffices for tokens and cards.