Just picked a brand new ONKYO TX-NR747 in clearance for £359 in Oxford store with 10% off VIP (normally £399, you can sign up for free for VIP on their website). I think it's a good price.
Check the list of stores where they have it and the condition. They also have some Open Box for cheaper.
THX®-Certified Amp Quality
DTS:X™ and Dolby Atmos® Support
175 W per Channel
Hi-Current Amp Design for Authentic Sound Reproduction
HDMI® 8 In / 2 Out Including 1 Front (4K UltraHD / HDCP 2.2 / HDR)
Bluetooth Audio / Wi-Fi® with Spotify and AirPlay
DSD 5.6 MHz, FLAC 192 kHz/24-bit Hi-Res Audio Capable
384 kHz/32-bit Hi-Grade DAC
AccuEQ Room Acoustic Calibration