Well...I don't think there are any! Okay, I saw one. Just got back from an 8 day trip there.
Snapped this photo driving by the dealership in San Jose. There was a 370z in the showroom. I watched as we were out & about, but never saw another one. Funny thing about the photo is that the car in it is a Sentra. Lots of Nissans there. Thought it was funny that it had 'Agencia Datsun' on the building as well as the Nissan logo.
A 370Z would be fun in CR - but only on certain roads. There are places where it would be impossible to drive becasue of the ground clearance - and the Ticos are very big on very big speed bumps as well.