[PC] DRM-Free - Transistor - $4.69 AUD - GOG

While not the all time lowest price, this is a great price for a fantastic game from the creators of Bastion.
And you will get it DRM-free too.😀

From the website:

From the creators of Bastion, Transistor is a sci-fi themed action RPG that invites you to wield an extraordinary weapon of unknown origin as you fight through a stunning futuristic city.
Transistor seamlessly integrates thoughtful strategic planning into a fast-paced action experience, melding responsive gameplay and rich atmospheric storytelling. During the course of the adventure, you will piece together the Transistor's mysteries as you pursue its former owners.

An all-new world from the team that created Bastion

Configure the powerful Transistor with thousands of possible Function combinations

Action-packed real-time combat fused with a robust strategic planning mode
Vibrant, hand-painted artwork in full 1080p resolution

Original soundtrack changes dynamically as the action unfolds

Hours of reactive voiceover creates a deep and atmospheric story

'Recursion' option introduces procedural battles after finishing the story
Fully customizable controls custom-tailored for PC.

Enjoy.