TPUG (Toronto, Canada) may have some C128s for sale at a reasonable price.
http://www.tpug.ca/index.php?option=com_content&view=article&id=73&Itemid=70By the way, I did use Magic64 back in the day on my 68040 Amiga2000. It ran pretty well, although it couldn't play everything. I did have to use frameskip to bring it close to normal C64 speed. I also tried FRODO but while it was more accurate it was too slow on a 68040.