Found this report. Kinda cool but I'm sure cost prohibited for most people.
http://www.myfoxtampabay.com/story/2796 ... y-patients
Here is a similar system I found in the UK. It's about 6k USD.
http://www.neater.co.uk/neater-arm-support
The 2nd has up and down powered motions by pushing a button. The 1st looks like it's more stationary.