The AAG Membership page is http://www.aag.org/Membership/member.html, and lists all the benefits of membership. The student membership fee is only $50 per year.
To join online go to http://communicate.aag.org/eseries/source/members/cmemberinsert.cfm and begin by filling in your personal information. Continue to follow the instructions given on the page.
To join by postal mail, print out an application available at: http://www.aag.org/Membership/Membership_Form.pdf
When filling out the AAG Membership form be sure to sign up for membership in LASG. Information on all of the AAG Specialty Groups can be found here http://www.aag.org/sg/sg_display.cfm
Please do not forget to indicate you wish to join the Latin America Specialty Group when completing your AAG membership.
Dues for LASG are only $5, with a student rate of $1 per year. Membership in LASG entitles you to access the LASG Bulletin Board and Discussion Listserve page on the AAG website (http://www.aag.org/sg/info.cfm), as well as voting rights at the Annual Business Meeting held during each AAG Annual Meeting, and access to the LASG/CLAG Newsletter, a joint publication of LASG and CLAG. Check the AAG Membership page for all of their membership benefits.
LASG encourages membership in CLAG, our sister organization, with student membership beginning at only $20, including two issues of the Journal of Latin American Geography every year. See: http://sites.maxwell.syr.edu/clag/clag.htm