https://www.gamespot.com/articles/9-games-to-pre-order-before-amazon-kills-the-prime/1100-6461408/

Amazon has announced it will stop offering 20% off video game pre-orders for Prime members on August 28. That makes today your last day to pre-order any games you're planning to buy if you want to lock in the discount. With that in mind, it's worth looking at what big games are available for pre-order right now.

But because Amazon doesn't charge you any money until the game ships, you can even pre-order any games you're marginally interested in, just to secure the discount if you decide you want to buy the game. Keep in mind that you can always cancel your pre-order at any time, at no cost, before it ships.