Halo 5: Guardians isn’t dropping until October 27, but Prime members can save $10 if they preorder today. This game has had a Prime preorder discount for awhile, but it used to be $7. As always with Amazon preorders, you won’t be charged until the game ships, you should get it on launch day, and [Preorder Halo 5: Guardians, $50 for Prime members only. Discount shown at checkout]

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