Harman Audio offers its factory-refurbished Harman Kardon 500-watt 5.1-Channel Home Theater Receiver with AirPlay, model no. AVR 1700, for $180 with free shipping. That's $9 below our September mention, $170 off list price, and the lowest total price we've seen. It features 100 watts per channel into five channels, six HDMI inputs, Dolby TrueHD and DTS-HD Master Audio decoding, and AirPlay support. A 1-year Harman Kardon warranty applies. Deal ends January 25.