Pre-Order for Massive FIFA 18 Deals
We are seeing a ton of FIFA 18 deals already and we don't expect to see a major change in deals after the release date, at least until Black Friday. Some retailers limit the time you can get the deals until the release date or shortly after it.
If you have Best Buy Gamer's Club Unlocked, you should pre-order FIFA 18 and get 20% off plus a $10 reward certificate. You can hold off another two weeks to see if Best Buy offers a major trade-in deal for FIFA 17 that could cut the price even more, but you'll still need to pre-order to lock this deal in.
Amazon is only selling the digital version of FIFA 18 right now, and they messed up the Madden 18 deliveries for many people. This means you can't pre-order and save 20% right now, but they've also stopped honoring the discount right after the release date for Madden 18, so be cautious here.
The end result is that if you don't want to wait until November for a FIFA 18 deal, you should pre-order in September to save on the game.