There's a clothing shop over here that rotates its stock frequently. New stock often comes in at "30% off RRP" (very little is ever priced at RRP). After a few weeks it may drop to "50% off RRP". After a couple of months, any stock left gets put on "Final Clearance 70% off RRP". Because the lines aren't restocked, you have to play a guessing game and take your chance on the best to to buy!
Black Friday never used to exist over here, but it's gained traction over the past decade, mainly due to online retailers. It often seems to be a chance for shops to get rid of unpopular stock or buy in cheap electrical goods which aren't usually part of their inventory to sell at headline-grabbing prices. I rarely find anything to interest me.