Turtles in Time was on SNES and its f'ing expensive (there was a TMNT 3 on NES called: Teenage Mutant Ninja Turtles III: The Manhattan Project, I've never seen a copy and can only assume it sells for a high price)
last ebay auction for Turtles in Time went for $70, and a BIN loose cart for $90!
I picked up Castlevania: Legacy of Darkness on N64 the other day.