Amazon offers the refurbished Yamaha 630-watt 7.2-Channel 3D Network Home Theater Receiver with WiFi Adapter, model no. TSR-6750WA, for $379.95 with free shipping. That's $420 off list price and the lowest total price we could find. (It's also $60 under the the best price we could find for a similar model elsewhere.) It features 90 watts RMS per channel into seven channels, Dolby TrueHD and DTS-HD Master Audio, 4K upscaling, USB, WiFi, six HDMI inputs, and one HDMI output.
Note: No warranty info is provided.