Another phenomenal tea company (and also a personal favorite) is Teavana! In addition to an adventurous selection of traditional old world teas, Teavana is one of the fleeting few companies that carries an exciting selection of traditional Mate teas!
Lastly, but certainly not least among tea companies, is Bigelow! As one of the new kids on the block (Having only been established in 1945) the Bigelow company has done well to make a name for itself. Either as a long time lover of fine tea or as a brewing novice, Bigelow offers a delightful and more affordable range of teas of all sorts!
A few other brands that I have found are quite good are:
-Red Rose (Which we all know for their delightful little figurines)
-The Queen's Choice (Which I am sure that she has never heard of) I found this tea, believe it or not, The Dollar Tree store. I wasn't quite sure at first but I was surprised at the quality of the tea. I find that it is a superb tea, especially for the value!