found via gothiccharmschool adagio tea sells loose-leaf teas & tea paraphernalia. they have all kinds; black, decaf, green, etc. & even fandom blends! (it's better to search for the one you're interested in, than to look through their list) there could be more than one for what you're interested in. for example; there are a couple for daniel jackson of SG-1, so read the flavor description to see if it's something you might like. they sell sample tins that make about 5 cups (except for some which are 10 or the ice tea, which is 6 pouches that make 40oz), so you can try it before committing to a larger amount.
they even tell you at what temperature & how long to steep the teas for.
make sure you read the whole page for the tea you're interested in, as some are higher in caffeine than others.