Organs are in desperately short supply. In the US alone, more than 124,000 people are on transplant waiting lists, and as many as 30 Americans die every day waiting for a donated organ. Trafficking in human body parts and transplant tourism are big business around the world, and “body bazaars” that bring together wealthy organ buyers and impoverished organ sellers are thriving. How do we decide who gets an organ, and when? Can an organ marketplace ever be an ethical way to distribute a scarce commodity? What other approaches can increase the supply of these precious resources?