Free USGS printable maps
These can be very expensive if you are buying them from REI or other out doors stores.
I know they aren't completely free because of the ink and paper involved in printing them, but they are certainly more affordable then buying the maps. This is especially true if you have a library or somewhere you can print for $0.05 to $0.15 a page
Anyhow this isn't too traditional so I understand if I get down voted for this but I wanted to share it.