Base game is part of EA play but this seems like a decent enough price if you want the GOTY.

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Info added by @Sashecuador

Dragon Age Inquisition: Game of the Year Edition Xbox (UK) includes:
Dragon Age: Inquisition base game
Official DLCs
Deluxe Upgrade
in-game items
The top 3 reasons to play Dragon Age Inquisition: Game of the Year Edition Xbox (UK)
In a world that needs heroes, become the savior of Thedas as chaos rains from above
Play as the Inquisitor and accept the task of saving the world
Experience a game where your decisions truly matter and shape the story ahead!
About Dragon Age Inquisition: Game of the Year Edition Xbox (UK)
Winner of over 130 Game of the Year awards, discover the definitive Dragon Age: Inquisition experience. The Game of the Year Edition includes the critically acclaimed game, official add-ons - Jaws of Hakkon, The Descent, and Trespasser - and added features.
Become the Inquisitor Create your character and lead a team of unique heroes on a perilous journey through a beautiful, open world. Tough choices define your experience, and even one decision can change the course of what's to come.
Jaws of Hakkon - Discover the fate of the last Inquisitor and the powerful dragon he hunted.
The Descent - Go underground to reveal the source of mysterious earthquakes threatening Thedas.
Trespasser - Decide the Inquisition’s final fate as new threats emerge.
Deluxe Upgrade, Spoils of the Avvar & Spoils of the Qunari - Customize your Inquisition with specialized gear, legendary weapons, diverse mounts, and unique Skyhold elements to personalize your home base.

What are the system requirements?
Xbox Live Account
Internet Access