Cheapest I can see on this 1st March release by a good £5 - £6. You'll need to use the pre-order code PRE5
.Horizon Zero Dawn an exhilarating new action role playing game exclusively for the PlayStation 4 system, developed by the award winning Guerrilla Games, creators of PlayStation’s venerated Killzone franchise. As Horizon Zero Dawn’s main protagonist Aloy, a skilled hunter, explore a vibrant and lush world inhabited by mysterious mechanized creatures. Embark on a compelling, emotional journey and unravel mysteries of tribal societies, ancient artifacts and advanced technologies that will determine the fate of this planet, and of life itself.