I haven't found as many Black Friday promotions this year for electronics - probably due to the ongoing supply chain issues. If you see a good deal that is not in the list, please leave a comment.
Adafruit has a code for 15% off all weekend here. It's also Feather Friday which means 20% off all Feather (mainboards) and wing (daughterboards) with the code shown in the site header today.
Parts Express (audio components) has 10% of sitewide.
Pololu Robotics & Electronics Black Friday and Cyber Monday deals on select products are here.
RobotShop has a sale on some items until November 30 here.
Jameco Electronics has free shipping with a code on all orders.