No, there are no free maps for MapMonkey.
You need Destinator3 maps. Maps from other versions of Destinator may work, but I'm not 100% certain. Search the forums for some more information.
I have download map monkey thinking that it was free. Well yes it is free but I didn't realise the maps weren't. Are there free maps out there anywhere or a free map system with maps that would work? I'm in the UK.