Just want some shirts from my favorite bands like Death, Lamb of God, Opeth, Etc. Maybe some good hoodies, too. Lowest prices, quality inventory, etc?
Ibanez RGA121 Prestige
Roland Cube 30X
Line 6 Pod XT Live
Ibanez AEL20E Acoustic-Electric
rockabilia (i think thats right) has a lot of good shirts...unless you want to go to...hot topic...
Threadless. By far. It wins.

:edit: Okay, I don't know about band shirts, but they still have amazing stuff. Basically everyone sends in designs, and you'll vote on the best one and that one gets made. The shirts are awesome.
Wolfie, Moley, Witty, Dgmey, Grundy