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I'm curious as to why you have the roasters grind the beans for you. Quality of ground coffee deteriorates much faster than whole beans. It depends on the grind size, but I'm pretty sure it's hours compared to weeks. A manual grinder like the Hario Skerton only costs $40 which is about the cost of a month of coffee beans for people who drink a cup or 2 every day.

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I'm fairly lazy so rather than make one or two cups of coffee a day, I prefer to make a one-week batch of cold brew at a time. (It's also a pain to manually grind that much coffee at once.) Cold brew is a lot more forgiving about "grind freshness."

I'm considering buying a grinder, but it'll probably be $100-200, and I'm not sure if that's worth the price when the coffee shop will do it for me.

Oh, if it's for cold brew than that's completely fine. Definitely not worth the price if that's all you're doing, but a grinder does give you the flexibility to make other types of coffee.

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