Try some homepages of mp4-player-Manufacturers or Shops like:
www.uxcell.com
www.cmx-electronics.com
www.nexxdigital.com
www.trekstor.de
Watch out for Downloads/Service/Support. The Filename's are mostly without "Smart" - you have to install and get running the AVIConverter to see the phrase in the Windowtitle. But some downloadable files are named with "176x220" or "240x320"- this is mostly a good hint of the AVIConverter Smart.