Just like in real life, many shops around Second Life has Black Friday sales. I’ll try to collect as many of the stores I can here for you, the list will update as I find more stores.
Grumble Grumble has it’s annual Black Friday sale and also a lot of hunts going on along with daily giveaways for both VIPs and non-VIPs
Tribute City While it’s not a Black Friday sale per se, Tribute City has it’s Harvest Month Fair with loads of stores giving you discounts and freebies during the rest of November.
5th Avenue Boutique Black Friday sale going on as well as work for models
The Warehouse Massive 100L$ sale