The standard edition of the PS4 version of Horizon Forbidden West is $10 cheaper than it is on PS5 and has a free upgrade to the PS5 version.
Horizon Forbidden West PS5 upgrade I How to get cheaper PS4
Buy Horizon Forbidden West on PS4, even if you want the PS5 version
Horizon Forbidden West™
Horizon Forbidden West plays just fine on a PS4 - The Verge
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Buy Horizon Forbidden West on PS4, even if you want the PS5 version
Horizon Forbidden West PS5 upgrade I How to get cheaper PS4
Sony PS4/PS5 Horizon Forbidden West Regalla Edition Video Game - US