[PC, Mac] Artrage 6 Digital Painting Software - A$60 (40% off, Was A$101)

Made by Ambient Design, a New Zealand based software development company specialising in creative tools for artists.

Not a subscription—buy it once, use it forever. You need to pay to upgrade to new versions (e.g. from 5.0 up to 6.0), but you get a discount. Great if you're on a budget and don't want to be locked into Adobe.

Not sure when the sale ends. It's been on since early Jan 2021. I don't expect it'll be on for much longer. If you contact them and find out, let me know and I'll add the end date.

From the website:

Unleash your creativity! Paint and draw with tools that work just like the real thing.

ArtRage is a digital artist’s studio with a full range of familiar tools that look and work like the real things. It’s a canvas for thick, expressive oils and delicate watercolors, a sketchpad with a full set of pencils, and a sheet of paper with a stack of wax crayons all in one.

Smear and blend thick oils to create natural color gradients.
Sketch with pencils and shade with the edge of the tip.
Create delicate watercolor strokes that react to canvas texture.
Use photos as References while painting.
Work with Guides, Grids, and Perspective Layout tools.
Features Layers, Blend Modes, and other industry standards.

With a wide range of traditional tools and powerful digital utilities, ArtRage is the perfect creative tool for anyone, kids to adults, amateurs to professionals."

Demo

https://www.artrage.com/demos/