Matches all time low Steam price as per Isthereanydeal, not sure if 20% from being a humble monthly subscriber is possible with this deal.
Keep in mind you may need the fan made FAR mod for this as the game apparently hasn't been patched since launch.
From Humble-
The NieR:Automata™ Game of the YoRHa Edition includes the game itself and comes packed with DLC and bonus content for the full experience of the award-winning post-apocalyptic action RPG, including:
• 3C3C1D119440927 DLC*
• Valve Character Accessory
• Cardboard Pod Skin
• Retro Grey Pod Skin
• Retro Red Pod Skin
• Grimoire Weiss Pod
• Machine Mask Accessory
• Exclusive set of wallpapers in the following sizes: 1024 x 768, 1280 x 1024, 1920 x 1080, 2560 x 1600
Seriously good, surreal game.