Hi,
As a librarian, I order international periodicals direct, particularly from Spain, England, France and Italy.
Yes indeeed, it is possible to subscribe to a Spanish magazine and have it delivered here. Contact the magazine's circulation department and ask them for costs delivery to a U.S. address. Be aware that if you have the periodicals mailed air mail, the cost is a bit higher than surface mail, while cheaper takes forever.

Then there are magazines like Hola which has a subsidiary here in the U.S. and have an international version, which means that it is printed here, but the news is entirely from Spain.

Also large bookstores like Borders, Barnes & Noble and Books A Million will also carry single issues of Spanish magazines.

Also, there is a website called Mediactivity.com that sells Spanish newspapers and magazines.

Saludos,
Booklady
¡Viva los Libros!