You can buy cold brew coffee at a coffee shop. But, if it happens to be from a certain Seattle-based java-serving monolith named after a Melville character, or an pink and orange East Coast chain known for selling fried rings of dough for, uh, "placing" into your coffee, then what you're actually getting is cold coffee...that is, hot coffee that's been iced down.
Cold brew is an entirely different beast altogether. And with the weather warming up, it's time to cool our coffee down. Or, more accurately, never heat it up to begin with.