For the Audiophile on your Christmas list (or to save a bit of money so that you'll have more to spend on everyone else), here are a few things that I've found. Please add more to this thread.
Roon Subscription: $1 for three months
https://land.roonlabs.com/black-friday-one-dollar
THX AAA 789 Headphone Amplifier (was $400, now $250)
If you listen to headphones more than occasionally, you NEED this amplifier!
https://drop.com/buy/drop-thx-aaa-789-linear-amplifier?utm_source=linkshare&referer=LKSGKM
HiFiBerry 20% off on November 27th with code BLACK_2020
https://www.hifiberry.com/blog/black-friday-hifiberry/
Qobuz download albums on sale until November 30th
https://www.qobuz.com/us-en/page/blackweek2020
JBL Studio Loudspeakers 52-68% off until November 27th
I've been a big JBL fan for ages. These are ideal for a 2nd system, theater applications, and may even be a good end-game system, depending on needs. These are the best prices I've seen for this line:
https://www.jbl.com/loudspeakers/STUDIO+530.html
https://www.jbl.com/loudspeakers/STUDIO+570.html
https://www.jbl.com/loudspeakers/STUDIO+580.html
https://www.jbl.com/loudspeakers/STUDIO+590.html
https://www.jbl.com/loudspeakers/STUDIO+520C.html
I'm looking forward to seeing what you folks find. Act quick if you're interested since a lot of these delas end tomorrow night.