Cold plunge (Glen Cove, Vallejo)

Anyone have a cold plunge that they thought they’d use but discovered they didn’t? I’m loving my current diy cold plunge, but it won’t stay cold enough. I’d love to upgrade but don’t have the $2-8k for something more long term.

I know this is a long shot, but figured it was worth a try : )
Can you help with this request?
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