I have a very small folding plastic table that I picked up at a local home improvement store (like Home Depot or Lowe's) that I use as my vacation sewing table. It's adjustable height, and even my big Janome 6600 fits on it with the extension table.
The machine doesn't drop down into it, but it was pretty inexpensive. (I want to say it was around $50)
This is the type of table I got. This is not where I bought it and I'm pretty sure I paid even less but this is exactly what mine looks like:
http://www.walmart.com/ip/ICEBERG-EN...tinum/14915898
It does vibrate when I get going top speed, but if I stay going slower it's fine.