I've purchased from College Crib, in store and on-line. I like the merchandise and they were fairly timely with delivery.
I've also purchased from G4L. I LOVE them!!
Other than these two, I get my stuff from my Soror Marina Cervantes who has a shop, The Greek House, in Berkeley CA (CAL, SFSU, SJSU, Cal State Hayward, and Stanford) right across the street from UC Berkeley.