In reply to Removed User:
Bangoods, AlienExpress and even HobbyKing plus numerous others are already selling the Xiaomi Yi...
I've had mine for a few months already.
The SJxxxx is also a good option.
And for a smaller one Mobius.
Basically it all boils down on what you want to do with it. They all have their pro's and con's. But they all seem to offer a lot better general performance for bucks than the big names (mainly GoPro).