Currently is £220.74 on Amazon
If you are looking for a motorcycle helmet camera with a slim profile and a price around £100 the only decent choices are Drift stealth2, Sena prism tube, Contour Roam 3. But all of it have the same problem can not be charged without to remove the back cover so without to loose the weather proof.
I think for this price range Contour +2 is the right choice for a camera to use it when you ride a motorcycle without to have attached a goofy rectangular brick to your helmet (yeah I'm talking about you gopro). It has gps tagging, Bluetooth connection for view finder and settings, laser levelling, rotating lens (yeah I know actually is the sensor), external microphone port (for the moto vbloggers wannabees or if you are full of having just the wind noise when you go over 20mph) , removable battery, waterproof case included in the package and of course it can be charged while you drive more than 2h. The only thing which I don't like is the fact that doesn't have loop recording.
Contour +2 Waterproof Case
Waterproof case protects the camera to a depth of 60m
5MP Still Photo Sensor
Photo Mode: Every 1, 3, 5, 10, 15, 20, 30, 45, or 60 seconds
AAC Audio Compression
External Mic Jack
Contour +2 | Lens
170° Wide Angle Lens
Custom Six Element Glass
Contour +2 | Mobile App
Mobile Apps Specs
Use Mobile Device to adjust camera settings, preview your shot, and start and stop recording
Up to 32gb MicroSD compatible
4gb MicroSD card included for UK orders
All video settings can be managed with the Contour Mobile App or Desktop Software.
Full HD - 1920 x 1080 @ 30/25fps
Tall HD - 1280 x 960 @ 30/25fps
Action HD - 1280 x 720 @ 60/50 or 30/25fps
Slow Motion - 854 x 480 @ 120/100, 60/50, or 30/25fps
Codec - H.264/AAC / File Type - MP4
Two video settings can be set on the camera and switched between without software.
Contour +2 | GPS
Built in GPS sensor
Video Mapping with free desktop software download.
Rotating Surface Mount
Built-in (1/4" - 20) Tripod Mount
Battery Life: 2-2.5 hrs
Instant-On Record Switch eliminates stand-by mode maximizing battery life.