In reply to fi89:
Yes they do, but you have to look hard for them, perhaps locally.
The 1:100000 is not good enough for trekking really. Especially in bad weather (which there will be). My advise would be to get a GPS and download a decent map onto it. A combination of the two (map for overall planning, GPS for fine navigation) is a good option.
As for getting maps locally, I found that the locals were really helpful, even over the phone. If you've booked a taxi ride and/or a hotel, then perhaps ask them if they know where you can get the maps and they might source one for you before you get out there?
Enjoy your trip. It's beautiful out there!