Did you know you can sell Body Parts in the USA

Question

Did you know you can sell Body Parts in the USA? Since USA is considered a truly free market economy, anything legal can be sold and is being sold. The government and the laws determine what can and cannot be sold. Can others please help in building this list:

You can sell plasma,
If you have a good head, your hair can be sold
Even breast milk can be sold

Can anyone expand this list.