World:Enter the Grey/Technology/Cybernetics
Cybernetics research is a highly advanced and regulated field. Medical procedures such as limb and organ replacements are quite common, and research exists at a military level to safely augment mental capacity through full neural interfacing. All cyborgs must be registered. While registration is a simple, completely acceptable process for most people undergoing medical procedures, this serves to make actual physical enhancement through cybernetic parts very difficult to obtain.
Black market cybernetics are rare, surgery can be dangerous to undergo, and parts often have unknown effects on human biology due to a lack of appropriate testing.