From what I have heard, the Quilt Halo is one of the better ones because it has some weight to it.
Instead of the Supreme Glide, you can try taping down an inexpensive piece of plastic from Walmart (clear plastic on a roll, in their fabric section). You can also use Teflon -- the flat sheets you can buy to place in the bottom of your oven to catch drips and spills.
A custom extension table for a vintage machine can be expensive. What I would suggest instead is that you make your own "table" from styrofoam. Here are links to how to videos that show how to do that:
http://www.youtube.com/watch?v=g14govA4pIM
http://www.youtube.com/watch?v=yAS25v3ZTk0
http://www.youtube.com/watch?v=A0lk7UBQgZY