From Wikipedia:

The Indiana Jones line of Mighty Muggs has been officially discontinued. Un-produced figures include Spalko (Crystal Skull), Saitpo (Raiders of the Lost Ark), Toht (Raiders of the Lost Ark), and three versions of Indiana Jones: College Professor (Raiders of the Lost Ark, Last Crusade, and Crystal Skull), White Tuxedo (Temple of Doom), and Young Boy Scout (Last Crusade).

Sad to see a great line end. Hopefully Hasbro will bring it back in the future.