** NOT RELEASE DAY DELIVERY **
GoHastings.com has Assassin's Creed IV: Black Flag up for pre-order for Xbox One here. Price is $39.99 plus shipping.
Shipping is $3.42 via Standard Mail or $9.42 via Expedited Mail. Worth noting that the game will not ship until release day, meaning it is probable that the game would not arrive until the week following Thanksgiving.
The game is not available in-store at the $39.99 price, but a $5.00 reserve can be made nonetheless (at the $59.99 price point). Also worth noting that the other versions of the game are marked at their regular $59.99 price.
This may be a pricing glitch. If it is a glitch, I must say that I personally have zero experience in how GoHastings handles things going forward.
CAG member "kodave" has a post here about GoHastings, which includes FAQs about the company.