Do a google search for egg donor and and open a window on a thriving marketplace for human eggs, with well established companies such as Egg Donation, Inc. ("where dreams come true") competing with a host of others. The word "donor" is entirely vestigial in this context (as the "..., Inc.") makes clear, and the repugnance that used to accompany such sales is becoming vestigial as well.
The Minneapolis Star Tribune ran an interesting story about that firm some time ago, by Josephine Marcotty and Chen May Yee: Oct. 21, 2007: Miracles for sale.
The article describes the modern egg donor:
"The clinics want donors who have a healthy blend of altruistic and financial motives -- women who want to help infertile women but who are practical enough not to do it for free. "