Amazon has discounted several official strategy guides at up to 42% off, including Assassins Creed Odyssey: Official Collectors Edition Guide, Pokémon: Lets Go, Pikachu! & Pokémon: Lets Go, Eevee!: Official Trainers Guide & Pokédex, Red Dead Redemption 2: The Complete Official Guide Collectors Edition and more.
Source: N4G PC Up to 42% off Assassin's Creed Odyssey, Red Dead Redemption 2 and other strategy guides