Maps of Ecuador, Peru and Bolivia
 

I'm only weeks away from touring these areas and I'm trying to arrange a route (read general direction..).
I'm surfing fleabay for a cheapo GPS unit to get me out of trouble (pretty sure any unit will work? maybe not a picture of an actual map but at least a co-ordinate? correct me if I'm wrong).
What I'm after is some maps. I hear that the only place to get them are from the military and they're quite pricey?
Does anyone have any maps they would like to sell or give (worth a go!) me?
Doesn't matter if they're scribbled on, in fact the information might be useful (I gave the roads I travelled my own star rating!)
Usually I keep all the maps of the places I visit "just in case I go back there....." of course I probably never will go back and if i ever manage to all the roads will probably have changed!
Any help would be appreciated.