If available, back issues are just $2.50 each plus postage.
The latest list from June 8, 2013 can be downloaded HERE.
Contact Lee Gong for the latest availability.
If there are particular issues you are looking for,
include those Volumes and Numbers when emailing him.
lgong@sonic.net
Lee Gong
Back Issues
1211 W. College Ave.
Santa Rosa, CA 95401-504