There is much confusion now about the state of Karma, it was first withdrawn from the market and then that decision was reversed.
http://www.ibtimes.co.uk/karma-drama-how-gopro-fell-grace-1594401
There are many alternatives to Karma, including the DJI Phantom 4 or you can even make your own open drone.
https://dronegarageblog.wordpress.com/2016/01/07/cx-20-the-open-source-alternative-to-dji-phantom/