Forbidden Planet are currently offering the trade of DC's One Million for £2.99. That's a monster of a bargain. If you're passing the Shaftsbury Avenue store it's worth picking up this Grant Morrison classic.
Orbital are selling cheap, cheap Heroclix and although their sale has officially ended you can still get your hands on several DC Showcases and a bunch of other cut price trades.
There's also a heap of fantastic new comics out this week. Sadly I am so exhausted tonight that I can't even summon the energy to read a stack which includes Captain America #34, Project Superpowers #0, Green Lantern #27, Black Summer #5 and Suburban Glamour #3.