Depends on where you go for your standard ultrasound. I don't get my in depth ultrasounds at my OB, but the place I go has given me free previews of her in 3D.
The OBGYN office I go to offers a free 3D ultrasound but if u miss the appointment an have to rescheduled then u have to pay for it. Ask ur doctors about it they may offer the same?
I get 3D and 4D every visit I go. I live in ARIZONA. My insurance pays for it