I love playing co-op games, especially with my mates but it sucks when own a game that your friends don't. Green Man Gaming has a way to help; it's got game bundles reduced by 75%, each containing four copies of a co-op favourite. You can pick from the likes of Chivalry (£15.50/$24.99), Killing Floor (£14.99/$19.99), Sanctum (£11.99/$14.99), and Awesomenauts (£6.99/$9.99).
It looks like GamersGate's Summer sale will stop for no one and this week it's 100% indie games on sale, with new daily deals to look forward to. There's some great titles reduced today including Hotline Miami (£2.36/$3.38), Reus (£3.50/$5.00), Torchlight 2 (£3.74/$4.99), and Bastion (£3.45/$4.50). Steam's daily deal for the next 24 hours is the Darkness II which is 75% off at £4.99/$7.49.