Courtesyparts link for the factory heated seat switch for $19 (you can use the diagram to pick the left or right switch, but they're basically the same, they just have slight differences in the connector so that you can't mix the two up):
SWITCH ASSY-HEAT SEAT - 370Z (Z34) 2009+ :: Nissan Parts, NISMO and Nissan Accessories - Courtesyparts.com