All these for the price of one PS4 game. Some are $8 but they are on special for 1/2 price or buy 2 get 1 free so it works out about $5 per game. : r/PS3
Can you play PS3 games on PS4? PlayStation 4 backwards compatibility explained
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How to Play PS3 Games on a PS4 With PlayStation Now
How to play PlayStation 3 game on your PlayStation 4 (Fully Explained) - YouTube
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Amazon.com: EVORETRO Premium Video Game Box Protector Case compatible for PS4 games, XBOX1 games, PS3 games - Premium Console Game Storage Solution - PET Protector case : Home & Kitchen
How to play PS3 games on PS4?! Backward compatibility explained. - YouTube