For under $150, including shipping, you can get a Gidget table for a regular size machine, that will allow the machine to recess, or be on top. You can buy a SewSteady insert to fit any machine for about $69-$65. If you have a larger machine you can get a Gidget II for about $250, and I think that includes the insert.
The tables are 42"x19" and quite sturdy. I have to butt them up to a larger table to quilt, but they are fine for piecing.