Up until 2016 eBay allowed the sale of human skulls. A group in California called Tibetan Magic was importing them from China. During massive road-building projects, China bulldozed a lot of cemeteries, villagers would gather the skulls and sell them to people who exported them to the US and other countries. I remember reading about a guy who had bought 5 of these skulls and had them in his apartment. A neighbor saw them and reported him to the police as a possible serial killer. Fortunately, the guy had kept copies of each of the listings for the skulls he bought. Most of the skulls sold by Tibetan Magic went for $100-$250.
Hundreds of mystery human skulls sold on eBay for up to $5500
https://www.newscientist.com/article/2097171-hundreds-of-mystery-human-skulls-sold-on-ebay-for-up-to-5500/
I remember reading how 125 years ago it was “chic” to have a human skull on the mantle piece. One man back then even was robbing graves for skulls.
Here is a link to artist Fredrick Remington in his home.