Unappetizing as it may sound, you can sell your hair, plasma, and breast milk in the U.S. In many larger cities, there are clinics that pay up to $35 for plasma, which can be given twice a week.
Another way to make cash is to cut off at least ten inches of uncolored hair, which sites such as The Hair Trader helps you sell, often netting hundreds or even thousands of dollars.
Finally, mothers with an abundance of breast milk can offer their milk for sale on the Internet, though this method is extremely questionable.
(Image via Flickr)