Yamaha has dropped the price of the RX-V667 from £450 to £350 effective today. Not all retailers are advertising this new price but here's one to get you started:
http://www.thehomecinemacentre.co.uk/index.php/home_cinema/home_cinema_amplifier/yamaha_rx-v667/
http://www.thehomecinemacentre.co.uk/index.php/home_cinema/home_cinema_amplifier/yamaha_rx-v667/