Garage sales, Craiglist, etc. Look for something the height you want, maybe something with a drawer or two. Take it home and screw down a cut piece of wood of your liking to be a table top. Drill holes and fasten it with nuts and bolts if you want it to be removable. Pick up some felt at WallyMart or a fabric store, cut and use spray adhesive to hold it down. If you want the performance surface to be more spongy (spun-gee... haha, spongy looks funny) put a thin layer of soft rubber or foam underneath the felt.
I believe the store, TJ-MAXX has some furniture at a nice height that would make for a great stand.
For mobility, if the stand/table has legs a board could be cut so that the table's legs fasten on top of the board and then wheels can be added underneath. This board would add and extra shelf and could be boxed in with wood, covered with material or left open, stained with similar color as the table.
If changing the look of the table or getting in to that much crafting isn't desirable, a collapsible hand-truck is convenient for moving around. http://www.amazon.com/Magna-Cart-Elite- ... B0010XS5PS