You don't have to go to PR, the Pfizer vax is available in SD and STI. I've got my first last week and the second in 3 weeks.There have been many articles stating u can get a second vaccine. You need to wait between them, I think it is a month, but no problem. Try researching it yourself before speaking.
If I don't get more here I will go to Puerto Rico for the Pfizer
The Pfizer stuff comes every friday to this country.