Rogue Warrior is a story-driven shooter that provides team-based tactical combat set in massive, contiguous levels using Unreal 3 streaming technology. Central to the game's single and multiplayer experience is the idea of a freeform battlefield, where players are given the freedom to choose how to more...

Use voucher code: shoptovoucher3 to get it at this price. Thanks to Gary_rip for the code.
Price is £14.85 without voucher code.
PS3 and 360 versions are also available for £24.85 or £23.85 with voucher code.

Cheapest price around for the PC version, I think the next best price is £17.73 at The Hut more...

This creature feature gets a pretty solid 6.6/10 on IMDb and the critics at rotten tomatoes just loved it too.
This is a fairly recent release and the next best online price is £7.99 from Play.com.