The only reductions on Mac products that I know of are found in the CCO/CCS (cosmetic company outlet/store) the stores have upto 30% off the retail prices on Mac. Generally the products are from previously released collections.
Once about two years ago, I was in Zurich Airport and the MAC counter had 30% off about a dozen selected shades of permanent and LE lipsticks. It was amazing but I haven't seen anything like it since.
The CCO does have some stuff from previously released collections but it is more overstock. I find it is mostly permanent collection stuff. But it is like $11 for a lippie
Mac was just offering $10 if $50. First time in my life have I ever seen them offer any discount other than free shipping. Not sure if the sale is still going on but check the site. I think it ended last night