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Onsen Spa Rentals is located just south of the University of Oregon along the train tracks and beside the Willamette River. It is both a salesfloor for hot tub purchases and offers 14 open-ceiling "rooms" with private hot tubs that are available for hourly rentals. The current price per hour is $20 for two people. It is recommended that you call for reservations, which are available 7 days a week. Monday and Tuesday have specials, generally four-for-two pricing and free soda evenings. You must have at least two people in order to use the rooms (safety), but families and groups are easily accomidated. The rooms have all four walls, but parts of the ceiling are open in order to allow you to feel as though you are part of the outdoor space. It is quiet and an excellent place to relax in a private hot tub. The offer soda and towels for purchase/rental also, but allow you to bring in your own as well. They are open year round.