The Tengai Makyou games were best sellers, but they are really cheap. Kabuki Den is $3. However, they are in Japanese, so that might be why.
Genpei Toumaden was extradonarily popular, but isn't much money due to how shitty and bizarre that game is.
Seriously, whenever I play that game, I fee like I'm high or something. I don't know wtf is going on, but I roll with it for a few minutes. The sequel is definitely better.