I'm new to Xbox and only just starting playing GOW4, saw this and thought it was a pretty good price. Need to have Xbox Live Gold for the price to be valid.
RRP for the standard edition is around the $25-30 mark.
Also bought the BF1 and Titanfall 2 deluxe bundle part of the EA publisher deal which ended at 9pm and then stumbled on this landing page with the Ubisoft sale which I think started today.
Ubisoft Publisher Sale ~50% off Range of Ubisoft games: http://www.xbox.com/en-AU/promotions/sales/ubisoft-sale
Ranges from standard and gold editions. Haven't really looked to see if there are bargains but thought it might be of interest to some.
Keep in mind when you click on the games links, they take you to the US store. So you need to edit the URL from "EN-US" to "EN-AU" for AUD pricing.
Was planning on buying this but may now hold off now considering its one of the games shown to be available on the Xbox Game Pass (when it becomes available).
http://www.xbox.com/en-AU/games/xbox-game-pass
Good price nonetheless and good to see somebody else discovering the Gears universe. You'll need to go back and play the others in the series once you're done with these.