Wow, what a bargain price for this splendid shooter, available on the PSN store.
The price was £6.19, but has been reduced to £1.19 for one week only, in time for SSHD's 3rd Birthday. (Offer changed slightly - see below)
Metacritic scores for this game average 85/100
You can also download a free patch for the game, enabling you to play it in 3D (if you have the technology to do such fancy things)
EDIT: It seems that Sony have goofed up this offer slightly, and instead are selling the Complete Pack for £2.39 (normally £7.99). This is still a bargain as you are getting the full game plus two chunks of DLC for just over two quid.
This offer is not listed in the Special Offers section either - you need to search manually for it in the store.