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Sous vide are even cheaper now, $30 for a basic one, provided you've got a stock pot or something large enough to set it in.

You need something to vacuum seal the food. Is that included in the $30?

That can be just a ziplock bag and the same water bath you're going to use for the sous vide anyway.

you really don't for most things. Ziplock is fine for things that take an hour or two.