You could probably email ADA directly about back issues. ADG is a real convenient way of subscribing from the US. They do not get anything from it either, except exposure for their company. The $112 is what ADA charges, tADG is simply collecting the orders.
Leafing through the Oct. AJ finds 2 email addresses,
support@adana.co.ja and
aj@adana.co.ja You could start the for info about back issues.