Wireless gyroscope hardware suggestions

The idea I'm working on requires gyroscope data as part of the controls.

Currently I've just been using the gyroscope in an iPhone and sending the data to Unity over OSC. Which works fine for demo purposes, but I need to find a more permanent solution. The trackers that come with the new sixense stem look like they will be perfect, however the release keeps getting delayed and I'm at the point where I need a solution ready in the next month.

So, any suggestions? I will probably be making a 3d printed mount to attach to an Xbox controller so the smaller the better. And ideally it will work with OSC protocol, but this isn't essential. Again, it needs to provide gyroscope values.