If you're missing a hand, getting a replacement isn't exactly cheap. The BeBionic -- which is, admittedly, a higher-end model -- can cost up to $35,000. We imagine that's a little out of the price range of many amputees.
It's unsurprising, then, that some have taken it upon themselves to find a more accessible solution. Robohand, for example, has been creating 3D-printed robotic hands for children, with a free, open-source 3D-printing pattern available on Thingiverse for people who wish to make their own.