Readdle creates apps like PDF Expert and Documents, and it’s celebrating Black Friday 2019 with deals until December 2.
PDF Expert for Mac at 40% off
Black Friday Bundle at 50% off: Apps include Scanner Pro, Calendars 5, PDF Converter, and Printer Pro
Premium Features in Calendars at 40% off
PDF editing in Documents at 50% off
I no longer use Readdle apps but these are great deals for great apps.