If you're looking for a dual lens or rearview mirror dashcam, the KEHAN H10 would be a good steal.
KEHAN H10 FHD Dual Lens Dashcam with Rearview Mirror: http://en.kehan.com/kehan-h10-dual-lens-car-dashcam.html (50% off for Black Friday)
Reduce visual obstructions while driving with the KEHAN...