Hmmm...well Aquarium doesn't seem to have much in the way of SPS, that I remember.
Coral Reef has some pretty awesome SPS from what I hear but I haven't been there in a bit. CR has really decent prices on frags, I believe.
Aquatic Marine doesn't have a gigantic selection (decent though!) but their prices are pretty good for SPS, plus they will frag stuff for you sometimes, if you're nice. They do have nice LPS though. Hard to touch them on some of the Aussie stuff.
Both CR and AM will special order most anything you want.
Best bet is to get frags from hobbyists though.