This just popped up in @mikahsargent ‘s tweets - posting here in case he isn’t able to logon right this moment. Go here for details:
https://www.pixelmator.com/blog/2019/11/26/black-friday-2019-special-offers-on-pixelmator-apps/
Edit: Pixelmator Photo for iPad is free for 24hrs (until 9am ET Nov 27). Pixelmator Pro is 25% off until Dec 3rd according to that page.