They are falling in price like a brick for a reason. Nobody is buying them because they are useless. Same as the HP fire sale on their tablet, loads bought them cheaply but don't use them because they are useless. Currently there are three viable tablet system. Android, Apple and Windows. Android tablets can be had for your £100 but the others can't. A £100 Android tablet will be pretty low powered and generally Chinese but they will run GPS software like Co-pilot and of course have the google maps app on them but you will need internet for google to work but not for Co-Pilot. If it has to be Mapsource probably because you have Garmin GPS then a windows tablet is your only choice but they don't come cheap because of the hardware required to run windows 7.