SoftUK are selling "Stranglehold" for the PC for £3.99.
Enter the code "Cheap Games" (without quotes) to get free delivery.
You can get cashback on this through certain sites (e.g. 2% Free Fivers, making it £3.91). You can also get £0.20 payback if you are a SoftUK Collector.
Next best price seems to be £9.19 from Forget The Rest.
Celebrate Pac-Mans 25th anniversary with the latest in the popular series, Pac-Man World 3! In a mad search for power, evil genius Erwin creates a machine that can penetrate into the world of the Ghosts...the Spectral Realm! But now the Spectral Realm is collapsing into the real world, and this will bring about a massive catastrophe that will plunge the world into a state of devastation for years to come! After mysteriously having been transported out of Pac-Village and into this strange and different land, it is up to Pac-Man to uncover Erwins plot and save the world. Along the way, Pac-Man will meet a host of unexpected old friends, and in order to defeat the ultimate enemy, he might just have to turn his old foes into allies!