G Ganen Cold Plunges

The true bottom-dollar pick, and Reddit's honest answer when someone says they have less than $100: a three-layer PVC folding tub with support poles that typically sells in the $55-$75 band on Amazon, where it holds 4.3 stars across 1,300+ reviews. It shows up in Healthline and Rolling Stone budget roundups for a reason — it works. The 31.5-inch Deluxe fits most adults seated with knees up, it collapses flat for a closet shelf, and reviewers repeatedly note it fits inside a shower stall, solving the where-do-I-drain-this problem apartment plungers hit first. Set expectations accordingly: the three PVC layers are waterproofing, not real insulation, so ice melts fast in summer; there's no warranty beyond Amazon's return window; and the support-pole structure is functional, not confidence-inspiring. As a proof-of-concept tub, unbeatable.