Saints Row: The Third is 50 percent off today only, running 800 Microsoft Points ($10). Major Nelson made the announcement over Twitter.
Normally, the season pass includes all Saints Row: The Third DLC at a 15 percent discount: Nyte Blayde Pack, Genkibowl VII, Gangstas in Space and The Trouble With Clones, and definitely not Enter the Dominatrix.
Grab the half-off deal via Xbox Marketplace, but make sure to download the DLC directly from the in-game store, unless you want to be charged twice. You masochist.