Funny enough, you want your coffee to off gas for some time after roasting. That’s why there are those little vents in the bags. Three days old coffee will foam a lot and taste off.

I don’t know how big the bags are you are buying, but I’m buying one kilo for between 20 and 50 Euro. Depending on how fancy I want it to be. But that’s hand-picked, fair trade, single origin coffee.