Here is a hand wrist brace you can make yourself on your 3d printer. It was probably designed to help deal with strain injuries, but do consult a medical professional.
It is probably much cheaper then the one you can buy in a local medical supply store.
All the files and instructions: http://www.thingiverse.com/thing:403001 it was developed by piuLAB.
It is heat formed with this method to fit your body:
http://diy3dprinting.blogspot.com/2014/08/how-to-heat-form-3d-printed-pla-parts.html