From the official site:
Commander Edition for Xbox 360 and PlayStation®3
Does not require XCOM: Enemy Unknown to play
Includes: XCOM: Enemy Unknown game, XCOM Enemy Within content, EliteSoldier Pack, Slingshot, and Second Wave add-on content
Batman A:O was $34.99 and then $29.99 with the same deal last week. Price is jumping around a bit, I got it for $35 but got a $5 gift card when I submitted for iron egg
add the game to your cart, then go to cart. you should see both in there already so just check out. code then gets emailed to you hours later, some people said 3 hours yesterday but it took me overnight. I suspect someone actually has to do it so it's affected by regular business hours.
On mobile so I can't check the thread too easily, but GTA V is $29.99. Everyone submit a price match to amazon
http://www.microsoftstore.com/store/msusa/en_US/pdp/Grand-Theft-Auto-V-for-Xbox-360/productID.294174800