I have had quotes from Nymoc (John, I think was his name) in the past.
I found that Claire, the Formulary,and Artcraft had him beat on price by quite a margin when I was stocking up on dry chems for the mix from scratch stocks 3-4 years ago.
Now I am getting around to restock on things I am running low on. Some of them the Formulary can't ship internationally. Post 9/11 this is due mainly to the ability to use them for more nefarous purposes than just in a darkroom.
So I may be visiting McGee St in the future.