So the deal is, Publix (based in Florida) stocked all of its stores with Moderna and certain counties had Pfizer. On their website there is a little disclaimer that the third shot is for people who are immunocompromised. The reality on the ground is, the Florida state authorities and health departments haven’t specified that the third shot is only for immunocompromised people, and they don’t ask when you show up for an appointment at Publix (based on second-hand knowledge, I haven’t gone in for my third Pfizer shot).
For example, old tweet,
~Max