I found a company that can create a pull-down from any map (MapShop.com), and also has a interchangeable system - where the map can be easily exchanged for, say, a localized map of only that State (called EasyRoller). The only drawback is the map cannot be laminated since static electricity is the "holding agent". The system does have a clear overlay built-in that is receptive to dry-erase markers: http://mapshop.com/classroom/classroommapaccessories/wall-map-displays-fx.htm