If you are an REI member, you can order the maps online to have them delivered to your home.
If there is an REI near you (I believe there are 4 stores in the Windy City area), you can purchase them there (you don't have to be a member, but for $20.00 lifetime, you can't beat it). If they don't have the maps, you can order them and pick them up at the store.
Some of your sporting goods stores have these maps. Chances are they may not have the Mt. Whitneys.
Then there is the downloading part which is cheapest but if you print them on an inkjet printer, you are in deep doo-doo.
Harrison maps are waterproof.
Hope our advice is of service to you.
BTW, ain't no such thang as a "dumb question."
Welcome to the Whitney Zone!
Have fun.
