OK, let me tell you something at NM store only:
Fendi/Chanel/Herms: never.
Tod's: shoes on sale; but not on bags. That's the reason last August I flied from Chicago to Woodburry outlet NY to get some Tod's bags. (I am a Tod's fan)
Some brands, like Jimmy Choo, Prada, Gucci, Salvatore Ferragamo, Mac Jacob, etc both sales on bags and shoes; BUT the styles/color you might not be interested.
Although you can get information of sale from NM website, some sale associates told me the store is kind different with website. To me I prefer go to NM store to try.
Personally, 牌子犀利, I might fly Woodburry outlet again if I have time as far as I have done a lot of 'homework' on the items I am interested.
Good Luck!