The ARRL sells a plain black 11x17 inch grid map of North America for $1. No color, no gray scale. Perfect for coloring in the grids as you work/confirm them.

http://www.arrl.org/locate/gridinfo.html

A smaller version of the map is also in the ARRL Operating Manual and perhaps in the ARRL handbook. I scanned, printed, and laminated the page from my ARRL Operating Manual.

Wayne Estes W9AE Oakland, Oregon, USA, CN81ik