Ay, honestly sis, di ko sure ng specific clinic sa Quezon Ave kasi lagi kami napupunta sa Makati for our 4D/5D scans, pero maraming kaibigan ko na nagsasabi na mas mura talaga sa provincial clinics or sa mga independent ultrasound centers kumpara sa big hospitals, you might want to ask sa local Facebook mom groups around QA area kasi usually may updated recommendations doon based sa latest prices! Have you tried calling around the smaller clinics near there? Sometimes they offer package deals rin if preggy kang ma-regular pa lang.