GoPro via eBay offers the factory-refurbished GoPro HD Hero4 Black Edition 4K Action Camcorder
, model no. CHDHX401, for $329
with free shipping
. That's tied with our mention of a refurb from three weeks ago, $79 under the best price for a new unit now, and the lowest total price we've seen. It features 4K video recording, up to 12-megapixel photos, waterproof housing (up to 131 feet), WiFi, and Bluetooth. A 1-year GoPro warranty applies.