For Black Friday, the StackSocial stores (links go to BoingBoing, but you can change the URL to CultOfTheMac or whichever spin-off you regularly use) are having 20% off storewide with coupon code
BFRIDAY20 (excludes Pay What You Want offers). They'll probably have a similar 1-day offer on CyberMonday as well.
In the
Software section, there's a bunch of language learning and other useful apps, but the potential main draw for MR goers might be the
Storyteller's Must Have Mac Bundle @ $29 before coupon discount, containing 7 apps from
Mariner Software for screenplay writing, word processing, journaling, plot and character development, and novel writing, etc.
There's 14-day trials and the User Guides for each on the Mariner site to try before you buy. I own much of this from getting them as top-up fills for previous pick-your-own bundle offers and their stuff seems pretty good, even though I personally don't use it much.