Wright Frame

A fully functional hard tech humanoid robot frame with no handwavium content at all, sold by "Wright Stuff Mechatronics" for $50k each. These had consistently high build quality, implementing all 640+ muscles in the human body, human-grade sense of touch, hearing and eyesight - no sense of smell or taste. Wright Frames would run on waved Li-on batteries for a few tens of hours, far less using conventional batteries. No on-board AI, still well in the Uncanny Valley, but pretty credible. They were selling at least hundreds per year, and all their (credible) potential competitors had detectable levels of handwavium.

The terms and conditions said "not licensed for off-planet use". At least one Fen got their fingers burned by waving-up a Frame, either as a remote or with a resident AI, the story isn't clear, and finding out it didn't work off-Earth; everything was perfectly OK on return to Earth. This would seem to be a consistent handwavium quirk, and considering the price tag on the Frames, no Fen bothered to look into it further.