First appeared in Whispers II, reprinted by Stuart David Schiff.
Summary: A reporter interviews man who sells himself off piece by piece to make money.
Spoiler and Analysis: He sells every last piece until he's dead (even parts of wife and daughter). Reporter decides he's not so different in how he sells off his own morals, bit by bit. Great connection adding more dimension to a disturbing piece, although we probably need more character background to make it resonate.
Scars, Matheson's collection, is a favorite of mine, largely for his style and voice. Dystopia is his collected works.