I like Pac N Sun, Buckle, Lucky brand stores, etc. I'm a big fan of the really soft tshirts, probably like what Harry posted above. Dicks/Shields also have some good tshirts. You get what you pay for, for sure.
Just.used.the.'47.website.as.they.sent.me.a.30%.off.coupon.code....went.to.the.sale.section.and.combined.that.with.the.30%.off.and.ordered.some.t's.for.$11.90.each!For music-themed I like Wolfgang's Vault
For sports themed I love this brand called '47. They sell them on Amazon - search "47 brand scrum T" Most comfortable t shirts ever
Weird question, I know, but I have found myself in need of a stack of t shirts, running very low. I just do not see myself going to 10 websites or 10 stores to buy 9 or 10 t shirts. Is there a place online you would recommend to buy a bunch of t's?