Spider seems to be more flexible on pricing than the coupe.
Not sure why, although there is talk that the coupe will leave us in 2017 (dealers are already only getting minimal allocations). There is nothing official yet, but a number of dealerships have been saying so since 2015.
There have been some +/- $10K discounts below MSRP reported on older Spider stock (depends on model year, options, and dealership situation). This seemed to peak in late fall, and might reflect dealerships in areas that get winter not wanting to be stuck with high/old inventories for 5-6 months. I don't know what the current situation is, but highly suggest that if your local does not capitulate you call others across state or across the country. Lots of owners have purchased thousands of miles away, and saved thousands of dollars in the process (even after shipping or flying to collect the car, and the hassle of out-of-state registration). Of course, if you can do a deal locally, so much the better!