Best Buy offers Red Dead Redemption: Game of the Year Edition for Xbox 360 for $14.99. Opt for in-store pickup to avoid the $3.99 shipping fee. That's the lowest price we could find by $5, although we saw it for $5 less during the week of Black Friday. This last-gen classic includes the base game and the Undead Nightmare expansion.
Note that this game will also work on Xbox One consoles via backwards compatibility.