Ciro Santilli
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Liquid nitrogen | 🗖 nosplit | ↑ parent "Nitrogen" | 119

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77K. Low enough for "high tempreature superconductors" such as yttrium barium copper oxide, but for "low temperature superconductors", you need to go much lower, typically with liquid helium, which is likely much more expensive. TODO by how much?
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Video 107. "Where Do You Get Liquid Nitrogen?" published by The King of Random on 2016-05-23. Source. He just goes to a medical gases shop in a local industrial estate and buys 20L for 95 dollars and brings it back on his own Dewar marked 35LD.
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Video 108. "Making Liquid Nitrogen From Scratch!" by veritasium (2019) Source. "From scratch" is perhaps a bit clickbaity, but I'll take it.
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