https://www.gamespot.com/articles/massive-humble-sale-on-pc-going-on-now/1100-6458887/

The Humble Store is on a roll lately. It's giving away a copy of The Flame in the Flood for free to everyone. It's offering what's shaping up to be a killer Humble Monthly for June. And now it's hosting a massive sale on thousands of games. On top of all that, it's reviving an old Steam tactic that keeps customers coming back day after day.

Before digging into the deals, let's explore the recycled Steam tactic. Between now and May 17, you get a stamp for every $5 you spend on the Humble Store, or for each daily visit you make to the Humble Store home page. Getting one stamp earns you 7% off the game Frostpunk and 10% off a new Humble Monthly subscription (signing up for June's Humble Monthly gets you Destiny 2 now, plus a set of free games when June rolls around). Three stamps gets you a free copy of Millennium: A New Hope, and five stamps gets you Whispering Willows for free.