Well, you know now to call next time b4 u go.
The list has vendors that sell CC, but not all have it in their stores, in that case, they can order it for you. This applies to all companies that sell to independent boutiques or feed stores. Sometimes ordering online is less than buying it directly from the store...free shipping too.
A week is too early to tell if the food is working, give it some more time & he can't have anything else, no treats, no chicken, nothing. What formula is he on?