Amazon Warehouse via Amazon offers the used Yamaha 630-watt 7.2-Channel 3D WiFi Network Home Theater Receiver, model no. RX-V677, for $169.70 with free shipping. That's $280 under the lowest total price we could find for a new unit. (For further comparison, we saw a refurb unit for $155 more in June.) It features 90 watts per channel into seven channels, Dolby TrueHD and DTS-HD Master Audio, 4K passthrough and upscaling, USB, WiFi, six HDMI inputs, and one HDMI output.
Of note, no warranty information is provided.