Well, unless you live in modern Iran. Then it's a fact of life. Iran has a legal marketplace for kidney sales, and while "kidney sale" immediately conjures images of spiked drinks and a bathtub full of ice and regret, it's all above-board. Poor Iranians are so eager to "donate" that the streets leading to some hospitals are plastered with homemade advertisements proclaiming how healthy their signmakers are.
Before you write off Iran as a backwards country with inferior healthcare, it's been argued that their system is in some regards actually better than that of the United States. For all we may squirm at the concept, Iranians in need of kidneys, well, get kidneys. Meanwhile, as obesity and diabetes rates continue to rise, America's demand for healthy kidneys is only increasing. As of 2015, 100,000 Americans were waiting for a new kidney, and in 2014, 7,600 Americans either got too sick (or too dead) to receive one.
Iran's healthcare system saves money overall, because patients get new kidneys quickly instead of spending a long time on dialysis, and the legal framework prevents the donor from getting screwed on payment. Plus, both donor and receiver must be Iranian nationals, so you don't see "kidney tourism." Iran has largely managed to address their organ shortage, although information on the long-term health of the sellers is unavailable, because the future is a morally complicated quagmire of nightmares.
The system has its flaws, of course, with prospective patients making some seriously sketchy side deals to get around waiting periods. Oh, and also the whole vampiric overtone of the rich buying body parts from the poor. That's pretty weird too.