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Easy:

* Oxo Compact Cold Brew Maker[0]

* Rad Power RadWagon[1]

[0] https://www.oxo.com/categories/coffee-tea/brew/coffee-makers...

[1] https://www.radpowerbikes.com/products/radwagon-electric-car...

$30 for the cold brew machine seem reasonable, but I’ve been pouring coffee in plastic bottles to make my cold brew. $0, I don’t even filter it as it just deposits at the bottom, but I don’t know whether the machine is somehow better.

I've found using a french-press with luke-warm water for about 12 hours works great. Probably not as strong as the cold-brew machine, but perfectly fine for my needs in the summer time.

I can safely say that my investment has amortized down to something very close to $0...

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