I got some hand-held medecine balls (the kind they use in the TLT's) from Amazon com for much less than I've seen them elsewhere. They are the Valeo balls, and come in 2# increments. The 4# balls are a pretty raspberry color!
You will also need a stability ball and light hand weights (they use 3#, 5#, 8# and 10# which is a good range).
And, for the gliding moves, it's best to have the most glide you can, rather than any resistance, because all the moves using the gliders/plates/rags are to challenge the stabilizers on the non-moving limb, and/or the core, NOT the moving limb, which should not have much resistance to it, for best results.
I have been using the furniture gliders on my puzzle mats, but they aren't glidy enough for some moves, so next time, I plan to use them on a yoga mat I have that has soft material on one side (to glide) and sticky on the other (to hug the puzzle mats).