I got this container at Whole Foods last year. It was about $5, and believe it... a little goes a long way. It is much sweeter than cocoa powder at about 20 calories and 3 grams of sugar per tablespoon.
The great thing about carob is that it's vegan, and it really does have a different flavor than chocolate. It can be mixed into recipes and hot drinks the same way as chocolate (start with a little at a time to account for sweetness!). I have not tried it with regular milk, but it does go well with alternative milks. On its own, at least in this powder form, it tastes kind of burn-y... if that's a good descriptor at all. :$
I will mention carob in a few of my future posts, so now you know what it is!
Oh, and did I mention it's caffeine-free? ;)