Most dealerships won't budge and would prefer to turn you away and let the car sit for weeks before lowering prices in my experience. YMMV but I assume extremely similar as you are in a populous region of California, they will bend on accessories but imo those are all crap and overpriced to begin with.
Cast your net a little wider, be willing to drive to San Diego or Bakersfield or even further to save hundreds if not thousands even after factoring in gas prices and travel times if new is the only option for whatever reason. In the early days many had
BRZ's shipped in from Colorado (many dealerships were charging $5k+ markups), I nearly flew up to Washington for a Hot Lava in November of 2012 (wish I had in hindsight).
Good Luck.