liveaquaria and saltwaterfish both have a arrive alive and 2 week guarantee (which beats the holy heck outta lfs
Both also have a good selection and competetive pricing.
GARF dot org has a good cleaner package and floridapets dot com has some great pricing on some macro/vascular marine plants (and some critters!)
edit - liveaquaria (and etropicals etc any dr foster smith peeps) have some seriously professional (by other standards) packaging, labelled properly, with instructions and a no nonsense customer service - I recieved a cleaner pack where the sea cukes were skrewt.. one had evicerate itself in transit.. I called them and said there was no way in hades I'd add any of them to my tank due to that..they said they understood, just dump the package and immediatly offered a credit or a chargeback... that's GOOD customer service considering the volatile nature of the creatures in question!