Adonit Pixel
What physical store in the San Francisco Bay Area definitely carries it?
This is an international Apple product user to user technical support community.
Not a social media Web location.
The chances of someone replying here that lives in San Francisco,and actualy knows whst stores would carry this stylus, is slim to none, here.
Why don't you just order it from either Amazon OR to make sure you get the most recent firmware for the Adonit Pixel, why don; t you just order one from directly on the Adonit Website?
https://www.adonit.net/jot/pixel/
Best of Luck to You!