Both Dead Island and Space Marine are out today on all platforms, but PC gamers can snag the digital version of either title for $10 off thanks to Amazon's Digital Download service.
You can snag Dead Island right here for $39.99.
You can snag Warhammer 40k: Space Marine right here for $39.99.
Both links support Co-Optimus!
Dead Island is available to play in four player online co-op right now (and it's damn fun) while Space Marine fans will have to wait till October for their online four player co-op goodness.