https://www.gamespot.com/articles/mgs-5-for-5-and-more-pc-games-on-sale-at-the-humbl/1100-6458280/

It's sci-fi week at the Humble Store. To celebrate the theme, the retailer is dropping prices on select sci-fi games. Other games are on sale as well, but not all of them will last through the week at their discounted rates. You can see the full list of deals here, and clicking on any game shows how long its sale price lasts.

Before we dive in, it's worth mentioning that if you subscribe to Humble Monthly, you get an extra 10% off on all games from the Humble Store. The discount stacks with these sale prices.