Is the idea so original, it would be wrong to copy it?
I bet someone could make their own equivalent pretty cheap.
Maybe take a ream of photocopy paper, with a rubber sheet on top, and putting something like a pipe (or another rolled up ream) underneath. Ideally, drill a couple holes, and put something through them so nothing slips. Or get fancier: cut an appropriate diameter pipe or spool, and gluing on the rubber sheet. (BTW, I haven't tried either.)
Or just buy inline skates at the thrift store, and practice holding an edge on them.
I recently started gliding to a complete stop on one foot and then try to hold the stopped position one the one foot.
My reflexes are currently way too slow to hold that position for long on the ice. Strength is an issue too, but unless when can learn to react fast enough, it may be a lost cause.
Perhaps you could stabilize at first with those ballet balancing sticks - or cheap dowel rods, cross country ski poles, or discarded broken hockey sticks. How about a big helium balloon?