A complete index of USGS topographical maps (2010-2012 versions) for Idaho state part 2. They are in 7.5-minute by 7.5- minute geographic format. These maps are free to download at the USGS online store, they just don't have a download all button.

info: http://nationalmap.gov/ustopo/

store: http://geonames.usgs.gov/pls/topomaps/f?p=262:18:2260051864249616::NO:RP,18::

I plan on doing more, place requests in the comments.