I figure these are reasonable enough devices that our sims could order one online or something, right?
Hygienator: Misc Electronics, cost 10,000 (Since it's basically just a fancy air conditioning sytstem?)
Harvester: Hobbies/Skills, cost 50,000 (Since it's more of a bonus for being a good gardener)
Miner: Misc Vehicles, cost 80,000 (Since you'll make that much in a day with the damn thing)
Requires Ambitions, obviously.