Bundles bundles bundles

hi guys :) i recently discovered this site, along with others and a lot of bundle sites. but i sometimes see a lot of games coming on here and i have no idea where they are coming from and why there are so many giveaways of them.
i have a couple of giveaway websites in my bookmarks, please feel free to post more down below or any other awesome websites that have anything to do with bundles etc.

www.humblebundle.com

www.store.indiegala.com

www.indiegala.com

www.bundlestars.com

www.groupees.com

and sometimes http://www.alienwarearena.com/ has some nice things on there.

EDIT: Also www.indieroyale.com www.indiegamestand.com www.bundle-in-a-box.com/ and www.humblebundle.com/weekly have been suggested in the comments. thanks :)

EDIT: Also websites that will soon launch giving us even more bundles http://www.flyingbundle.com/ and http://www.blinkbundle.com/ have been suggested in the comments. thanks :)

EDIT: A nice little website that collects some of the best giveaways out there has been added :) http://www.indiegamebundles.com/

is this just about every possible (steam game) bundle or discount site? or are there still sites i have to see?
thanks :)