Good price for a pretty decent, visually stunning, sci-fi thriller starring the Cruisemeister. Stand-alone Blu-ray seems hard to find online, especially at this sort of price. Good price if you don't want the boxset posted recently containing a bunch of other films. For steelbook collectors, the steelbook is available for £10.00 (see link below).
If you prefer, there is a boxset available for £10.00 at Amazon containing Oblivion and Battleship (link below). Personally, I don't think Battleship is worth the extra £5, but maybe someone likes it.