Not to take any work/money from Walter, but it seems you should be able to download whatever Sectionals and or TAC's you desire from the internet at http://aeronav.faa.gov/index.asp?xml=aeronav/applications/VFR/chartlist_sect or http://aeronav.faa.gov/index.asp?xml=aeronav/applications/VFR/chartlist_tac , unzip them and either load the .tif files (or convert them to .jpg with one of any number of free or commercial applications and load) directly to your device. Of course they're not stitched together, and you'll have to open a new map file whenever you cross boundaries.
All the digital downloads from the FAA: http://aeronav.faa.gov/index.asp?xml=aeronav/applications