Stumbled upon these sites the other day and thought that they were too good to share! Check them out and make your own conclusions, enjoy
http://www.humblebundle.com/
http://www.indieroyale.com/
http://www.indiegala.com/
http://www.bundlestars.com/
http://bundle-in-a-box.com/
Non-Steam Games
http://game.giveawayoftheday.com
http://agsbakesale.com/
http://www.indiegamesbundle.com/
http://theturtle.editions.free.fr/nanigaming/freeindiebundle/ I
http://gamedevbundle.com/
http://indievania.com/games/99-percent-bundle
http://theindiebundle.com/
http://www.intermediaware.com/bundle
http://www.buygamesnotsocks.com/
http://radiangames.com/bundle/
http://www.positech.co.uk/winterbundle/
http://blurst.com/store/
http://www.amazon.com/Ansca-Inc-Corona-Indie-Bundle/dp/B005WMKP42/ref=zgbsmobile-apps_19
http://www.indievania.com/bundles/milkstone-studios-bundle
http://vidjahgames.com/iupbundle/
http://www.indievania.com/games/lunar-pack
http://www.indiegamebundles.com/recessionbundle/
Some of these websites are still under construction
Others
http://newyearbundle.com/
http://www.gamemusicbundle.com/
http://groupees.com/triforce
http://groupees.com/eta
Edit: Included all of Adi's links
http://www.humblebundle.com/
http://www.indieroyale.com/
http://www.indiegala.com/
http://www.bundlestars.com/
http://bundle-in-a-box.com/
Non-Steam Games
http://game.giveawayoftheday.com
http://agsbakesale.com/
http://www.indiegamesbundle.com/
http://theturtle.editions.free.fr/nanigaming/freeindiebundle/ I
http://gamedevbundle.com/
http://indievania.com/games/99-percent-bundle
http://theindiebundle.com/
http://www.intermediaware.com/bundle
http://www.buygamesnotsocks.com/
http://radiangames.com/bundle/
http://www.positech.co.uk/winterbundle/
http://blurst.com/store/
http://www.amazon.com/Ansca-Inc-Corona-Indie-Bundle/dp/B005WMKP42/ref=zgbsmobile-apps_19
http://www.indievania.com/bundles/milkstone-studios-bundle
http://vidjahgames.com/iupbundle/
http://www.indievania.com/games/lunar-pack
http://www.indiegamebundles.com/recessionbundle/
Some of these websites are still under construction
Others
http://newyearbundle.com/
http://www.gamemusicbundle.com/
http://groupees.com/triforce
http://groupees.com/eta
Edit: Included all of Adi's links
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