All these teas sound delicious.
I've had some teas that seemed "sweet" even thought there was no sweetener (artificial or otherwise).
I think "Yogi Caramel Bedtime" was one.
And from "India Organics" a couple I loved: "Sweet Rose" and "Licorice Spice".
Most teas with licorice taste kind of sweet to me in general.
Both of these brands are probably available at Whole Foods.