ebay.. you can get both parks 99c incl shipping,
"Both" parks?
I'm not sure if this is the kind of thing you're looking for, but you can order maps on Disney's website that you can customize yourself. We've ordered them before and they're very nice....
Also, on AllEars they have a listing of all the maps for the parks and resorts... (I hope it's okay to post this link) You'll see the maps for the resorts first, but if you scroll down, you'll see the Theme Park Maps. I hope this helps !
http://www.wdwinfo.com/resortmaps/