Hi mama! Hindi ako taga-Zamboanga pero I have a few friends there and from what they've shared, you might want to check with your OB or the major hospitals like Zamboanga Medical Center or Polymedic Hospital kasi sila usually may referrals for 3D/4D ultrasound clinics nearby. You could also try asking sa local mommy groups sa Facebook para sa Zamboanga moms specifically, they usually know the best places and prices sa area! Good luck sa ultrasound, sobrang exciting yan