The high price point of Awakening is still a bit of a sore point for many gamers, myself included but it's here, and it's here to stay. The expanded adventures of the Grey Wardens is still a good standalone expansion of a good game, although perhaps not quite as impressive as it ought to be once all is said and done.
You can currently pick up a copy of Awakening for your Xbox 360 for just £22.49 at Coolshop, which is the cheapest you're going to get by over £2.
Essentially more of the same, Awakenings takes place following the last battle of its predecessor and you'll be pleased to know that you can import your character over from the first game, which will affect a few of the conversations and situations in the game - nothing too drastic, mind you, but it's a nice touch. If not, then you get to start with a whole new Origin as a Warden of Orlais and, as per usual, your decisions throughout the game will affect the ending.
There's trouble afoot even after you've quelled the Blight as it seems that somehow a smattering of Darkspawn are reaching human levels of intelligence, something you discover whilst on the way to Vigil's Keep to assume command of the Grey Wardens residing there. Only the keep has been hit hard and the organised attack appears suspicious indeed. Cue an investigative quest to find out what the hell is going on, and you'll muster a little party - Oghren returns from the previous game to lend a hand - and off you'll go on your merry way.
In terms of getting an idea of what Dragon Age is all about in general, then I'd direct you towards my review of the first game here. Awakening is not as good in all honesty. The story is okay for the most part but the lack of returning characters - particularly when the first game relied so heavily upon building up relationships between each character, learning their backstories and investing in them - is most keenly felt. Their replacements here are pretty unmemorable and this game answers none of the questions that you might have had following the conclusion of the previous title. It's a shame, really, and one that takes a lot of the shine off of this really very good new chapter in the Dragon Age saga.