Disclaimer: I make no claims as to how long these sales will last, if the codes will work, or anything else. Just trying to be helpful. 🙂
A Sound Effect
Up to 80% discount on more than 500 sound effects libraries until November 27
https://www.asoundeffect.com/superb-sound-effects-sale/
Apogee
20%-60% discount
http://www.apogeedigital.com/black-friday
Arturia
50% discount on individual software instruments and effects until Tuesday 28th November 2017
https://www.arturia.com/store/analog-classics
Audio Damage
35% discount on plugin effects, plugin instruments, Eurorack modules
Code NONMOREBLACK
https://www.audiodamage.com/
In addition, all Audio Damage iOS apps have dropped two tiers in price for the duration of the sale.
Audiofied
Various discounts
https://shop.audified.com/blogs/news/black-season-2017
Audiority
25% Discount (Echoes T7E and bundles excluded)
Code Black2017
https://www.audiority.com/shop/
Analog modeled Italian Magnetic Echo Plugin (VST, AU and AAX) until 1st December for $29.
https://www.audiority.com/shop/echoes-t7e/
Black Lion Audio
20% discount on modifications during November
http://bit.ly/nov-2017-sale
Fabfilter
25% discount on Fabfilter Total Bundle until Monday November 27
Web: https://www.fabfilter.com/shop
Glitchmachines
40% discount on all purchases until November 27
Code GLTCH40
https://glitchmachines.com
Heavyocity
Up to 50% discount
https://www.heavyocity.com/products/
Lethal Audio
30% discount on Lethal + 2017/18 Expansion Bundle FREE until November 30
Code BFRIDAY
https://www.lethalaudio.com
Native Instruments
50% discount on instruments
https://www.native-instruments.com/en/products/thanksgiving-2017
Output
25% discount on software
https://output.com/products
PreSonus
50% discount on Studio One and Notion
https://shop.presonus.com/products/software
Softtube
Various Discounts
https://www.softube.com/buy.php
Soundmorph
50% discount on everything for 1 day only (November 24)
Code BF2017
https://www.soundmorph.com/
SoundToys
50-60% discount until November 29
http://www.soundtoys.com/black-friday/
Twisted Tools
33% discount until December 1
http://twistedtools.com
Umlaut Audio
up to 30% discount on Kontakt instruments
https://www.umlautaudio.com/shop
Westlake Pro
Various Discounts
https://westlakepro.com/blackfriday/