TomTop offers this 2.4" 1080p Night Vision Dash Cam with DVR in Black for $14.29. Coupon code "AK5471LCX" knocks that to $8.29. With free shipping, that's the lowest price we could find by $4, excluding the below mention. It features a 2.4" LCD, up to 1080p video recording, 12-megapixel still capture, 170° wide-angle lens, infrared night vision, motion detection, TF card slot, suction cup mount, and car charger.

Note: This item ships from China and requires 10 to 20 business days for delivery. The countdown timer on the product page does not reflect an actual expiration time and resets daily.

A close price: ActPlus via eBay offers it for $8.88 with free shipping. (It ships from Hong Kong and requires three to eight weeks for delivery.)