At the bottom of the page there are instructions how to request your free calendar by mail:
"To request a free 9”x12” wall calendar, email firstname.lastname@example.org, subject line “Calendar”. Be sure to include your full, correct postal mailing address. Calendars are available while our supply lasts. Requests from the USA will be sent by first class mail; all other requests will be sent by airmail. Multiple copy requests (i.e., for a group of classrooms, etc.): Tell us how you plan to use them, and we will be pleased to send them to you, as long as our supply holds out."