If your birthday is after 7/1/04 an AMA membeship is $1 for the year. If you will be 19 before 7/1 it's $58.
The application is here:
http://www.modelaircraft.org/templat...-files/902.pdf

The AMA web site is here:
http://www.modelaircraft.org/templates/ama/

AMA insurance is good anywhere it is legal to fly... including at the club you are at now... as long as YOU comply with the Safety Code.