where I am they have like ultrasound boutiques to do 3d/4d and only had to pay like 50$ but the techs weren't trained or anything they just knew how to take the pictures, but also I wanted some more done at the end of my pregnancy and told my doc about and she was pretty nice to give a reason for me to go even if it wasn't much of a reason
I went to an ultrasound place also. They did the 3/4d and gender reveal for $80. They give you cd with the entire video session, CDs with just the pictures, and also printed out the pictures and gave me a bag with little coupons and prenatal samples and stuff.