Auction

In 64, in Rome, under the eyes of the First Doctor and Vicki Pallister, Barbara Wright was sold by Sevcheria to Tavius for 10,000 sesterces after a slave auction. (TV: The Romans)

Jamie McCrimmon was kidnapped by the Voraxx, who brought him on board their slaver ship and intended to sell him in a slave auction. He was rescued by the Second Doctor and Zoe Heriot. (COMIC: POT 2)

The Dalek nicknamed "Metaltron" escaped from the Last Great Time War to 21st century Earth, was bought in a private auction by Henry Van Statten for his collection. (TV: Dalek)

In the Unthinkable City, specifically created on 21st century Earth, an auction to sell the Relic (the Doctor's corpse) was set up by Qixotl. (PROSE: Alien Bodies)