You can sell many body parts and fluids without dying: milk, marrow, semen, 1 kidney, pieces of liver, blood, eggs, etc. And has been pointed out by you and ot

You can sell many body parts and fluids without dying: milk, marrow, semen, 1 kidney, pieces of liver, blood, eggs, etc. And has been pointed out by you and others, one can theoretically sell the rights to one's body parts after death, assuming the contract is enforced.