Well it depends on what exactly you want, is it just plain t's or printed t's? For plain shirts you might as well stick with the labels you're already buying, though you could also opt for Hanro, Pearse, 3 Dots, Margiela, or a store's brand (Saks, Neimans). If it is the printed style then you should let us known what your style is (unless you don't really know and just want to see what options are out there). It seems that, as with jeans, every designer also has a t-shirt line out there. To see the designer's take on the tee I would check out
www.firstview.com and search through their archives. There is also a swelling underground of labels that just specialize in t's and sportswear which are way too numerous to list.
Www.digitalgravel.com is a good site to find out about more urban leaning companies on this side of the coast. I find some of the shirts by Rabbit and Redtree,
www.rabbitandredtree.com, to be amusing (the tank and Lambo ones). Also a good resource to more emerging labels is
www.beinghunted.com., though they focus on other areas of fashion (sneakerpimps) and indie arts/artists too. There is
www.2kshirts.com for artist driven versions. London, the EU, and Japan are now a hotbed for creative t-shirt design, especially if you like the idea of really, REALLY limited edition items. You should check for the likes of One True Saxon, FAKE London, Bape/A Bathing Ape, Supreme, Burro, Silas, Alabama, Burn & Violet, SSURS, Rake, Undercover, Recon, Defacto Deathcamp, Buddhist Punk, Maharishi, Keanan Duffy, Red Ear, and on, and on. If you punch some of these into Google you should find online dealers, or at least pics. Finally you could use the tried and true method of just wandering out to your local Salvation Army or Goodwill and search for some great vintage finds that may lurk within. If that bothers you I hear that there are some stores up in NYC, and elsewhere, that will do retro iron-on prints upon new blank t's. Happy hunting. . . P.S. Speaking of t's, and Dolce & Gabbana, I'm really liking their plain one's with the military rank sewn on the left sleeve. It's simple yet stylish, the combination all one needs. These catch anyone else's eye?