Keep your eyes open. I'm aware, in just the 18-20 months (or has it been longer, more like 24-30? Time flies
) I've been using this stuff, of three of those half-price promotions. They seem to do them 1-2 times a year for a few weeks. If I happen to come across it again, I'll post here and let everyone know.
I don't do much of that kind of work anymore (page layout, newsletters, flyers, brochures, etc.), but I am keeping my eyes out for another half-off promo so I can go ahead and snag Publisher for ~$30. At that point I'll have viable counterparts to the three core Adobe apps I've ever needed/used (Illustrator, Photoshop, InDesign) and should be able to handle anything - for pay or for fun/favor - thrown my way.
And, from all I've heard/read, these things absolutely fly on the M1 Macs.