Required list of Vaccination Center where Pfizer is available

Hi ;
Did any one knows where to get Pfizer second dosage? i have take the first dosage on 09-May-2021 in Riyadh,  and from that time i am trying to get appointment on sehatty for Pfizer in Dammam, first of all appointment are not easily available in Dammam but some how i get one appointment once i went there they told me they have ASTRA vaccine and Pfizer not available. So can any one give me list of vaccination center where Pfizer is available so next time i try only on those centers.

Secondly i need to know if there is any place where we can get second dosage of Pfizer without appointment even if we have to pay.

Thanks