It says it's only available online, but I saw it in the store in Palo Alto, CA. It wasn't with the fragrances, but on the top shelf in the Bobbi Brown makeup section.
I live in Syracuse, NY and have not yet looked for it here, but I don't have high hopes for finding it. It would be nice to find out I was wrong about that though because I would love to get a sample of it before I buy.
In terms of if it is sold in Sephora stores, I have never found it in store! :(