I got my girls dresses at Davids Bridal but my next place to look was Bella Bridesmaids in Madison, NJ (it's a chain with a few locations across the country so if you have girls in different areas) or Nordstroms Wedding Suite at Garden State Plaze
I got mine from Hollywood Bridal in Kennilworth. They are so lovely to work with, I also got my wedding gown there AND they do free alterations, which is a huge plus!
Certain Macy's stores have a bridal department. Alfred Angelo in Cherry Hill (yes its drive, but worth it if you like the work since its all they sell obviously).
Re: Bridesmaids dress
and yes JCocco219, free alterations = AWESOME!