Any other sites which provide good discounts on games??
chrono.gg and fanatical.com (formerly BundleStars) provide pretty deep discounts with the former gives a large discount on one particular title a day and the latter providing discounts on individual games and also packs of assorted games (normally on the lower end quality wise but you can pick up some real hidden gems).
Sites like the Humble Store and GreenManGaming also provide alternative sales for Steam games if that's your preference.