Marketplace
Humble Bundle's Spring (Autum) sale has begun! There are quite a few bargains to be had amongst the dross. Every day there are a bunch of new games.
You can also sort by Most popular (Bestselling) and Highest Discount (if you are cheap):
https://www.humblebundle.com/store/search/sort/discount
https://www.humblebundle.com/store/search/sort/bestselling
Some recommendations:
Antichamber $2 (80% off) https://www.humblebundle.com/store/p/antichamber_storefront
Platformines $2.50 (75% off) https://www.humblebundle.com/store/p/platformines_storefront
Solar Flux $1 (90% off) https://www.humblebundle.com/store/p/solarflux_storefront
Dark Souls 1 $5 (75% ) https://www.humblebundle.com/store/p/darksouls_preparetodie_…
Dead Core $3.33 (67% off) https://www.humblebundle.com/store/p/deadcore_storefront
Legends of Grimrock 1 $3 (80% off) https://www.humblebundle.com/store/p/legendofgrimrock_storef…
TUG $3 (85% off) https://www.humblebundle.com/store/p/tug_storefront
Also, Get games has various SquareEnix titles on sale: http://getgamesgo.com/specialoffers?pub=square-enix
Deadly Premonition 90% off at $2.49….hmmm….