You could phone them and ask. Funny you should be looking for them. I bought my mum one of those last christmas for a jokey stocking filler (from the US $9) She`s never used it but says she wants to now that they have come out over here.
Do they come as a pair? Or just the one? Do you just put your foot in and it 'does its thing'? or do you have to move your foot around whilst its in there? if its the latter, is it suckered to the floor? The info on the JML page tells you nowt!