Hi there! Here are a few links that seem to offer maps of Spain in Spanish for sale:
http://www.libreriavitorio.com/Carritos/Mapas/carrito.htm
http://www.digiatlas.com/cgi-asp/gis.asp
http://libroyocio.everest.es/novedades.asp?submat=723&mat=779
None of these locations are in America, but online shopping knows no barriers!!!
Good luck! Plume