Denon AVR-S920W 7.2-Channel Full 4K Ultra HD AV Receiver with Wi-Fi & Bluetooth - Factory Refurbished for $299 + $8.99 S&H (FedEx ground shipping).
Accessories4Less has a Denon Factory refurbished Denon AVR-S920W receiver for $299.99 + $8.99 S&H. Excellent reviews, comes with a 1 year manufacturer warranty, and decent specs too.
3D, 4K/60p, BT.2020, 4:4:4 Pure Color, HDR, 21:9
HDCP Compliant 2.2