I agree with the interlocking foam mats atop a hard-surface floor (needed to keep your machine level). However, I do find as I age that I'm able to stand for shorter and shorter lengths of time, but I love to spend hours quilting. I'm short and my machine is set up as low as it will go, so I determined to get a drafting chair. Those puppies are expensive!
When I started looking (office supplies, furniture, etc.), I discovered many, but few under a $300+ price tag. But good ol' WalMart to the rescue (walmart.com). I simply typed in "drafting chair" (no quotes) and found they have quite a selection. I ordered a really nice one, generously padded, fabric covered, and chose one with no arms. It is completely height adjustable and quite sturdy. I have removed the interlocking mats and simply move my chair on its 5 wheels atop the hard-surface floor.
I plan to continue quilting for many years this way. (Incidentally, I'm 4'11", so do run into these challenges from time to time.)
Happy quilting.
Piecefully, Jo