Target again offers Red Dead Redemption: Game of the Year Edition for Xbox One and Xbox 360 for $14.99. (Best Buy and Amazon have it for the same price.) Opt for in-store pickup to avoid the $4 shipping fee. That's tied with our mention from February and the lowest price we could find by $4. It includes the base game and the Undead Nightmare expansion.
Note that this game will work on both Xbox One and Xbox 360 consoles.