https://www.maricopa.gov/5659/COVID-19-Vaccine-Locations
Maricopa County maintains a vaccine finder map and calendar on their website
NOTE: The dose for kids ages 5-11 is different than for those 12 and older.  NOT ALL LOCATIONS OFFERING PFIZER VACCINE HAVE THE DOSE FOR THE 5-11YO.  MAKE SURE TO SPECIFICALLY SEARCH FOR PFIZER (5-11) TO FIND LOCATIONS THAT CARRY THE PEDIATRIC VACCINE