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The Cryo Chamber was obtainable in Season 13: "Become a Supervillain" by reaching level 7.
Supply is widely distributed — no single holder owns enough to register as a hoarder.
Cryo Chamber having a MU of ~60, is considered rare but something else that is considered very rare is the London telephone sofa which has a MU of ~61, and has similar MU to other furniture that are considered very rare e.g trapped bookshelf with MU of ~67 and Beach hammock with the same MU of ~60. Suggestion made by: @binbonney1