A half gallon of cold brew coffee is up to $7. I can make it myself for a fraction of that, but it’s more labor for me.
I mean, only a little bit of labor. Even with premium grounds, I can’t imagine it costing more than 50 cents to make a half gallon. As for labor, just throw it all in a pitcher, give it a quick shake or stir, then leave it in the fridge for a couple of days. Pour it through a standard filter. I use the basket from my regular coffee maker.
Making your own cold brew is one of the most cost-efficient DIY foods out there.