http://www.slate.com/articles/news_and_politics/view_from_chicago/2015/07/egg_donation_price_fixing_lawsuit_did_fertility_clinics_conspire_to_limit.html

If a woman supplies one of her own eggs to a fertility clinic, how much should she be paid? Under the economic laws of supply and demand, the price of the egg will reflect a balance between the willingness of one party, usually an infertile couple, to pay and the cost in pain, risk, and trouble undergone by the woman who provides the egg. Prices could be as high as $50,000, or more. But women are typically paid $5,000–$10,000. That’s because of a price-fixing conspiracy among medical clinics—according to a lawsuit that is making its way through federal court.