The Humble Store is running a sale on Dark Souls II and Dark Souls III this weekend. You can get Dark Souls II: Scholar of the First Sin for $9.99 and Dark Souls III for $14.99. Dark Souls III: Deluxe Edition is on sale for $21.24 and includes the base game plus the Season Pass. If you already own Dark Souls III, you can buy the season pass for $12.49.
Source: N4G PC Dark Souls II and Dark Souls III are on sale this weekend for under