I had mine done at 27 weeks...I did research on google to find like an ultrasound school and I paid only 100 bucks and that had picture (printed and cd) and also the video. Even though it was a school everything was amazing. I recommend you to do some research and find the best deal.
I'm not to sure you could probably call the ultrasound clinic and see if they have it. mine was just at my doctors and she like switched something on the computer to 3d mode during the ultrasound. it was really cool because I didn't know they were even going to do that and they even gave a little video.
I wish I had done one. It would've been totally worth it
I agree with ahhhpenguins, I just had my 18 week ultrasound and they took a few 3d pictures and a video and he still kind of looks like an alien lol.