Due to rising costs they have now gone from magazine to online only. I subscribed earlier this year and purchased a few back copies and, if I recall, you could still buy out of print ones as copied editions.
I was trying to find out what you were looking for. Several have mentioned contacting Mike or Toni to ask about buying back issues. That is probably the best way to get the issues you want.
Ebay is sometimes a good source. At the moment there 3 listings for single issues and a seller with issues 1 to 26 broken in to two 13 issue auctions. Prices are not very good on any of these but if you are patient and look often you make find something to your liking.
Gail in NM