Hmm I'm not too sure about the exact costs per visit lah, since it really depends on what's done each consultation — best to call NUH's billing counter directly and they'll break it down for you! From what I've heard from other mums though, private does tend to give you more ultrasound time and you usually get to take home printouts, but whether it's every single visit I'm not 100% sure, so worth asking them to confirm when you call.
Eh hiiiii! Welcome to the private side, haha! at Nuh each visit, consultation plus ultrasound together, comes up to around $170, and that's not even including any extra blood tests, jabs, or growth scans lah, so can add up quite a bit more depending on what they do that visit. As for ultrasound pics, they do scan at most visits which is shiok.