luv- that's an AWESOME desk!
I, too, have a 6' table that wobbles at certain speeds, and I'm just toying with the idea of putting a stabilizer two-by underneath it until I can get something sturdier. I don't see the DH building me one like his anytime soon.

Bought the gidget. Hated it. Sold it. Bought the sew ezi. LOVE THE SEW EZI. Very stable and comes with the custom insert for your machine.

I also use a wood kitchen table, it is very study and works great for me! Craigslist is a great place to look!

Im using one of my old office tables

I have an arrow gidget 2, They also make a gidget 1 for smaller machines. Mine has been great for the past year. I love it

If you have an IKEA buy one of their desks , not to hard to put together . Mine was way less than $200 in the scratch and dent area.

My Janome came with a table, so not sure what they cost, it also does not fold up. But I bought the SewEz for my Viking Topaz and love it. It has the wheels and a cover so when you do transport it, it is protected a little. It comes with an insert and I bought the wood insert so I have a flat surface when using the embroidery part. Good luck - hope you find one you like.

I bought one of the library-type display tables from Boarders ffor $75. 60"x30", and rock solid. Try places that have used office/commercial furniture - these things are built to take a lot of abuse and may not be pretty, but will last