Hi - i agree with physiobob on a number of points.

1. If it costs more than 100-200 dollars, i really have to see whether it is is worth the money or not. Will more patients come to see me because i have this tool? Will i get a better result because i have this - at the moment i would argue not although it may improve compliance with exercise if it is interesting...

2. I only use wobbleboards to keep the surgeons happy - they ask for it, they want to hear their patients are using it, i want their referrals - you know how it goes. I give them more functional things to do but make sure i follow their guidelines because in the real world, the surgeon just asks "did the physio give you wobble-board exercises?" and i want my patients to be able to answer "yes"!

3. Wobble boards do not improve proprioception.

4. I have found that standing on it with one leg improves the muscles in the arch of my foot - that is what i use it for!

Good luck - unless it is part of some ground-breaking research that means everyone will want to buy one, i don't think pricing it high will help