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I always look for price/weight or price/volume or price/count stickers but many retailers and items only list the price making you do the math.

Even then, I’m aware that many items have differences in content which game the price/measurement like a lower ingredient content (less cocoa per measurement and more fillers or water content).

There is not really a great way to combat these practices if you are not some kind of professional buyer that only purchases at wholesale scales.