Where to buy a good quadcopter?

I'm looking to get a quad copter that takes video. I would want one that either has a really good camera built in to it, or one that allows you to attach a iPhone to it and use that for the camera. If anyone know where I can get a really good camera quadcopter.

People who make drones do NOT make cameras that are any good. The better results come from a higher end copters that have a camera mount so you can add your own GoPro. The camera mount is one of the secrets. It must be a vibration/shock resistant gimbal or the video will vibrate. The copter + mount + someone's third party camera means a higher end device.

Look at Parrot or DJI.

Also - look at 2 weeks ago South Park episode that centered on drone use.

http://southpark.cc.com/full-episodes/s18e05-the-magic-bush

Define "good".

I got a DJI Phantom 2 Vision +. The camera and gimbal mount system that comes with is is great. As it hovered about 2 feet off the ground and I was holding the control - but not touching the joy stick, it flew away on its own and plowed into a pole damaging 2 propellers (I bought spares) and the safety bumper system. Assuming you have good liability insurance and your insurance company knows you will be using the radio controlled unit and you follow All the directions to the letter (as I did, including calibration every single time it powered - do the dance!) and plan to not fly around people or things that can be damaged or injured, then you should be good to go.

Personally, the flyaway problem of RC stuff (DJI is not alone) got me to me return quad to the retailer. They gave me a full refund as I had not had it very long.
http://rc.runryder.com/helicopter/t752954p1/
http://www.phantompilots.com/viewtopic.php?f=5&t=704
There are many more… And the issue is not limited to only this manufacturer.

Attaching an iPhone for video capture seems a bit odd to me… If you decide to go the RC route, I hope yours does not flyaway. Had mine done that at 200 feet high as it had been only minutes earlier, there's no telling where it would have ended up since the 15+ minute flight time at full speed on the fully charged battery could have had it almost anywhere within a huge radius. And watching $1,300 just fly away would have been really sad and frustrating. And if it had caused an accident, hit someone or something causing injury or worse or damaging property would have made it even worse.