Some pricing seems pretty crazy. I had to sell my new, unused Datahand last summer due to life drama...sold it for $1,000 plus the chair kit $200 (at cost) to an RSI sufferer. A few months later one sold on Ebay for $2,000. That's the most I've seen them sell for. A couple had sold the previous year for around $1,500...but mostly $850-$1,100. It's hard to make sense of it all, LOL
I wish I still had my Datahand/chair mount. I had purchased it for a reason