I know this looked down upon but any chance I can buy a copy of monster hunter world for the steelbook and just return the game? The reason why I am asking is because I am getting the monster hunter edition PS4 which comes with a copy of the game. No need for two copies of the game.
Best Buy will usually ship the items separately, at least in my experience, and therefore, each item will have a different invoice. Chances are, if you order online, you could return the game and keep the Steelbook for free. But if you buy in store, they will all be on the same transaction.
I had this happen recently with South Park: The Fractured But Whole. They shipped the beanie and game separately, with two different invoices. I went to price match the game, and the associated returned it, sans beanie, and I didn't get charged. Same thing happened with Overwatch and that metal license plate they gave away. Try it and see what happens.