If you're thinking of DNA sexing then I recommend tree too birds. It's only about $30 and they can teach you somethings.
I don't recommend you take them to summer tree clinic. The staff is extremely rude, our baby died an hour after visiting their office. They wouldn't let my boyfriend go in with our conure, he took it home and I called them to ask what to do while our baby was struggling to breathe. The receptionist said, "nothing." When I said over the phone, "It's dead." She just said, "ok" and hung up. I haven't written a review on yelp or anywhere as it angers me and I doubt I'll be able to control myself. We still have the paperwork of when our baby was taken there and I regret it to this day. Their price in May 2013 was $6 for being a new patient and $65 for an annual check.
I regret it because they said they needed to inject him with antibiotics and after they did our baby got really weak, worst than when it was taken in. It probably would have been better off if we never took him there. I'm sure another vet would have done more rather than see how much they could make from a baby. Or at the very least had a receptionist with common sense and a heart.
ETA: They also never explained why they felt the need to inject a 6 week old conure with two shots. The conure was also breathing fine until ten minutes after when they gave him back. It wasn't his feeding time and they tried to tell my boyfriend to let them feed him. Really? His crop was full. I guess they felt $20 was worth it. If this vet has any common sense I suggest they get a new receptionist and learn about when to feed babies.