Search and download for free USGS Topo maps, current and historic. Some are available in 1:25,000. If you're poor and don't have a lot of resources, you can make custom maps by downloading the pdf and take over into Photoshop Elements and customize your map for 8.5x11 printer. You can also take this to a local printer that has a large plotter and can print the whole map out for you. Note that any map in UTM is also MGRS as MGRS is abbreviated UTM.
http://geonames.usgs.gov/apex/f?p=262:1:608365488