I buy black tea. 100 tagless tea bags for a buck. I'll add mint occasionally, which I grow here. I'd love to do some chamomile though!
It costs me $0.03 to make a pint of tea. I could knock a cent off of that if I only used one tea bag instead of two, but whatever. Costs more when I sweeten it with honey too, but I try to trade for my honey and typically only use it as a treat. Usually it's sweetened with sugar, and that's added into my costs. I use quite a bit of sugar too... If someone used less sugar (or sweetened with stevia?) And only one tea bag they could get a pint for closer to a penny, or even less if you cook tea bags on the stove and make a gallon at a time or reuse tea bags. Anyways, other than herbal teas, or if you're the dooms day type, there's not much of a point in making your own black tea. Herbals though, boy can they get expensive!