Wife and brother are in Krabi area and looking to get vaccinated but are looking for a Pfizer or Moderna vaccine, does anybody know if they are available there and where or how to register there

No they are not available in Krabi yet.

Many locals registered at the local private hospital in June for Moderna vaccine and paid for their vaccines in advance.

They are due October-January.

The second wave of registrations made in July are for vaccination in April-June.