You can legally trade plasma for cash in the U.S., the fluid in which your blood corpuscles and other tiny bits circulate through your blood system. In most larger cities, there are clinics that will pay you up to $35 or so for some of your plasma, which you can donate twice a week. The process, which involves taking blood, draining off the plasma and returning the remains to your system, takes around half an hour to an hour. To donate, you'll need to be relatively healthy and drug free.
