How much would an ultrasound cost?

So I just went to the dr. I was considered high risk for this pregnancy due to genetic history in my family. All my testings came back negative and low risk but my high risk still wanted me to get a 28 and 34 week ultrasound just to measure her growth. Well I decided to have the baby in a different state so I can have my mom by my side and at my first drs app today (will be 28w Friday) they said they won't do anymore ultrasounds and don't do anymore after the anatomy even though my high risk wanted to measure her growth. So I'm opting to pay out of pocket to get one done. How much would it cost to get one done out of pocket if I was between 29-31weeks??

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