https://www.cnet.com/news/did-amazon-just-nix-its-20-percent-prime-discount-for-remastered-games/

It's an open secret among deal-hunting gamers: Amazon is often the best place to buy new games. Not because of Amazon Prime's free two-day shipping, but because Prime members can preorder practically any game for 20 percent off the sticker price before it comes out. 

But apparently, that Prime discount may not apply to remade, remastered or re-released games anymore. That's according to an update to Amazon's terms-and-conditions page, as spotted by Reddit and others.