I know of none that have in the past... however, there was also no car in their history that has had the demand. Saturn as a whole does not want their retailers to charge over MSRP, but since most are privately owned locations, there is nothing to stop them from charging a market adjustment.
Mine is an MSRP retailer... as is their Pontiac dealership next door.
It has been the policy around here, that they have no haggling pricing. But it has been a long time if not ever that Saturn has had a car that people were really anticapating. I know my dealer is selling the Sky at mrsp, but I know others in the IL. area that are selling it for 5K above.