AltaTac via eBay offers the GoPro HD HERO4 Black Edition 4K Action Camcorder, model no. CHDHX-401, for $449.99. With free shipping, that's $50 under our mention from a month ago (which included a $50 REI gift card) and the lowest total price we could find by $44. It features 4K 1080p video recording, up to 12-megapixel photos at 30 fps, waterproof housing (up to 131 feet), WiFi, and Bluetooth.