When I can, I make tea out of the plants that I grow personally. I love chamomile, mint, and green tea personally, although I also have some store bought teas that I keep around for when my plants aren't ready to harvest. My personal favorite store bought tea is Mint Medley which you can find at Wal Mart and some Dollar Generals. It has a calming effect that helps me sleep after a long day at work.
I live in the south so Lipton is another store bought tea that I drink, although that is for flavor alone, not for any medicinal use.