You can order the Austrian ones direct from the club at
http://www.alpenverein.at/shop/
and the swiss ones from:
http://www.sac-cas.ch/Verlag-und-Clubshop.296.0.html
It pays to be a member.
If you are in Europe the large bookstore in the Zurich train station stocks most of the swiss maps, in Austria try the map shop in Innsbruck next to the OeAV headquarters, or go to the headquarters themselves for OeAV maps. Careful in the mapshop - it's easy to drop $$$ in a shop that has an entire floor devoted entirely to climbing, skiing and hiking guidebooks and maps.