Junktown

Junktown was a Farmworld alternate reality market place first seen in Season Five Episode One episode Finn the Human.

Anyone seems to be able to sell their goods there as Farmworld Finn was sent there to sell his mule Bertram but attempted to sell the late Simon Patrikov's crown instead (which really belonged to Farmworld Marceline).

Cash is the most prized commodity but at least person offered his services to barter. The market consists of open barrows of vegetables and other goods including one run by Choose Bruce. It sits below the clubhouse of the Destiny Gang

As a result Junktown was frequently harassed by them and when a revolt lead by Finn and Bruce broke out the gang burned it the market to the ground.

Trivia

 * Junktown is the name of an important city in the 1998 post-apocalyptic video game, Fallout.