You about making your own tables (for each machine) out of styrofoam? These Youtube videos are about making a large quilting table, but you could use the same idea for small tables. They would be lightweight to store also. My dh made me a big one for my cutting table that I love, and it's very easy for me to install and de-install it.
http://www.youtube.com/watch?v=g14go...ure=plpp_video
http://www.youtube.com/watch?v=yAS25...ure=plpp_video