I have seen a few on WinMX - the problem is that I'm usually about 100th in line to receive the file
Also you need to be able to do file searches in Japanese. If anyone wants to try it, the name on the clips is "Quiz Time Kogakusei" ("Kuizu Taimu" in katakana, "Kogakusei" in kanji - if you know Japanese you'll know how to type this.)