This weekend there is a sale for over 300 games going on at humble on all sorts of titles and series.
Newer titles like Republic Remastered and Sunless Sea are going for 20% to 50% off. And some classic series are also going for up to 90% off.
Also remember that MOST purchases on Humblebundle are redeemable on steam (less commonly sometimes Origin/Uplay). Just remember to check for the steam logo when you choose the game.