Anarchy Reigns is amazing. It's one of the most ridiculously brilliant online multiplayer ever released, hailing from the developers of Bayonetta and God Hand, but SEGA royally screwed the pooch by staggering the release date, leaving the player base fragmented and very sparse.
£2.78 is an absolute steal, but remember that Amazon charge delivery on orders under £10 unless you have Amazon Prime. Worth adding onto an existing order, perhaps, or getting from a mate who subscribes for the Instant Video. Thanks to Wishwash182 @ HUKD!