Best Buy via eBay offers the Yamaha 5.1-Channel 4K Network AV Receiver, model no. RX-V381BL, for $179.99 with free shipping. That's $40 under the price of a sealed unit. It features 140-watts per channel, YPAO multipoint optimization, 4K Ultra HD pass-through, four HDMI input, one HDMI out, Bluetooth, and 40 presets.
Note: This item is new, but may not ship in original packaging.