I'm looking for a used one, to make sure any issues are already fixed (no dealers around), but have seen several brand new '08s with $15K off MSRP, so yes, it's a heck of a deal, but definitely not unheard of.
If that's exactly the car you want, and you want new, then I'd definitely jump on it man. It's not going to get any better than that IMO. If you want a different color or option(s), keep looking because there're many around. Also try cars.com. It's usually useless IMO, but not for the Cayman. And if you find a pristine used one ('06-'08) at a great price while you're shopping, please let me know

. Good luck.