Getting a 3D/4D ultrasound?

M
For a little less than $100, I could have a 3D/4D ultrasound, and get photos and full video of my baby. Well, I'll have an extra $100 soon, and I'm really considering it around 30 weeks. I just had my 20 week scan the other day, and I have no idea when I'll be having another one at my obgyn. Should I go for the ultrasound, or save my money and buy things for my son instead? 

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