I will be visiting the Cordillera Blanca region down in Peru this next summer and wanted to buy some big maps to start planning some stuff out. Where is the best place to buy detailed maps of that area? Or just of Peru in general?

This one is a good map:

https://www.amazon.com/Cordillera-Blanc ... blanca+map

Omni Map has lots of Peru Maps, including of the Blanca, but individual IGN quads can be expensive:

http://www.omnimap.com/catalog/int/peru.htm#p12