I don;t know where you are located, but I had a gender scan at Fetal Fotos in Rozelle, Sydney. I only did a 5 minute gender scan, for the bargain price of $100. !! It was worth it though. On the net, their website say they can do gender from 15 weeks, but when I rang up to book I was going to be in my 14th week for the appointment, and she said they can actually do gender from 14 weeks..And they say they are 99% accurate.
I went at 14w5d, and within 2 seconds of the scan starting she said def a baby girl, and each u/s since has confirmed it is indeed a girl.
Hope this helps, GL !