Adorama via eBay offers the GoPro HD HERO4 Black Edition 4K Action Camcorder, model no. CHDHX-401, for $399 with free shipping. That's $33 below our mention from four days ago and the second lowest total price we've seen for this camera. (It's a current low by $57, although most sellers charge around $500.) It features 4K video recording, up to 12-megapixel photos at 30 fps, waterproof housing (up to 131 feet), WiFi, and Bluetooth. Deal ends March 16.