This wandering merchant sells a variety of junk, equipment, and weaponry, but also dabbles in scavenging and selling robot parts. He's built a good rapport with wastelanders, and Sheriff Simms of Megaton is particularly happy with his purchase of Deputies Steel and Weld. He can currently be seen wandering the wastes with his robotic entourage, which includes an old Mister Gutsyarmy unit named Sergeant RL-3.
Joe sells Sergeant RL-3, a robot companion, for the price of 1000 bottle caps (500 with a Barter skill of 70) if the player has a neutral Karma. If he is dead, Sergeant RL-3 will no longer be available for recruitment as a companion.
Tinker Joe refuses to sell Sergeant RL-3 to the Lone Wanderer unless they have neutral Karma saying that he "doesn't like the look of you."
Sometimes after the player character has bought Sergeant RL-3 and chosen him as a follower, Tinker Joe and his protectron will randomly spawn with you after fast travel or entering a location then run away, most of the time resulting in his death.
After reverse pickpocketing items onto Tinker Joe it may take up to three days before he'll equip the new items; entering and exiting nearby locations such as the RobCo Facility or Tenpenny Tower will not speed the process.
He will sometimes equip gear that you sell him, such as raider armor.
Tinker Joe says the other two robots are reserved for delivery, but he never leaves the vicinity of the Robco Facility.
Xbox 360 It is possible that Tinker Joe will be stuck with the protectron and the Mister Handy in one spot. Interaction will not be possible. Killing any of them will result in them disappearing. [verified]