I saw this randomly yesterday when browsing Amazon, but Ratchet and Clank Rift Apart is 20% off if you have an Amex card and pay with it and have some points.
I preordered it for $55.99 yesterday and thought I'd pass it along. I think I had like $7 in points I put towards it so the total out of pocket after tax was $52.
It appears to be on more than this too. I preordered RE8 for $50 after taxes and am contemplating doing the same for Returnal but it comes out right before RE8 so I don't know if I wanna do that since I doubt I'll finish it by RE8 time.
You may need an Amex card already linked to Amazon to see that offer I'm not sure. I also noticed that sometimes it wouldn't show up on the page after I purchased it and had to refresh sometimes to see it on there again.