I just checked on an OEM Nissan parts site (just a random dealership selling parts online) and they list the Sport 19's at $796 for the front $847 for the rear. That's honestly about what I expected; OEM replacement wheels are usually ridiculously expensive. It will probably take a while before resale prices on OEM wheels start to level out.
I know the 19's are still made by Rays, but you can get a really nice set of 19" Volks for cheaper