Most people buy things online these days so they isn't much fat to cut for sale prices since they are low to begin with. The computer parts people really want are out of stock anyway.
The only time black Friday sales were good were back when Amazon sold just books and stores would have low stock of the sale items (loss leader) just to get you in the store to buy other items.
What I collect: 68K/Early PPC Mac, DOS/Win 3.1 era machines, Amiga/ST, C64/128
Nubus/ISA/VLB/MCA/EISA cards of all types
Boxed apps and games for the above systems
Analog video capture cards/software and complete systems
Bookmarks