Holey Moley - $100,000 just for the Care-O-Bot arm.
Stanford says they aren't very safe either.
The DLR-LWR III arm [14], Schunk Lightweight Arm [15], and Robonaut [16] all use motors directly mounted to each joint, with harmonic drive gearheads to provide fast motion with zero backlash. These arms have somewhat higher payloads than the other arms discussed in this section, ranging from 3-14 kg. They are not designed for human safety, having relatively large flying masses (close to 14 kg for the DLR-LWR), although demonstrations with the DLR-LWR III have been performed that incorporate a distal force/torque sensor that uses the arm’s high bandwidth to quickly stop when collisions are detected. Of the robotic arms discussed previously, those that are commercially available are all relatively expensive, with enduser purchase prices well above $100,000 USD.