The best maps available are

INFOtrekking de la Patagonia

• Mte Tronador, Paso de las Nubes (1:50,000) $30
• San Carlos de Bariloche (1:50,000) $30
• San Carlos de Bariloche (1:125,000) overview of whole area $30

Available for sale at the Mountain Information next to Club Andino Bariloche (CAB).

Google Map (Satellite View) of the trekking area

Overview Map of the main Trekking Areas in Bariloche - click to enlarge