In India, there’s a big business peddling the wombs of surrogate mothers. Companies hire them, get them impregnated, and make them stay in dorms which are basically comfy prisons with good food and health care. (Which is a good deal, if you’re an extremely poor Indian woman, but still isn’t fair.)
The dark side of all test tube babies is that multiple eggs are fertilized with sperm. Many die, but many live. The surviving proto-babies are implanted in the mother’s or surrogate’s womb. In the US, “extra” babies that survive are often “reduced” inside the womb to “give the other baby a better chance to live;” although many parents are okay with having multiple babies at once. (Which is good, but of course they usually had already set things up to have a buttload of their own kids die in the Petri dish.) But there was a notorious case in Thailand of an American couple abandoning their Downs Syndrome baby and only taking the “good” twin home.
In India, some companies keep the existence of “extra” babies secret, let the surrogate woman deliver them all, and then sell them on the black market to desperate would-be adoptive parents.
Followup by an Australian news show of an Australian couple that abandoned their surrogate-born boy in India (because they already had one boy and didn’t want another) and kept their girl baby. The boy was adopted by another family in India, but it’s not clear whether he was sold or given. (And either way, it’s not terribly legal under Australian or Indian law.)