If you are planning to visit Tana Toraja, it would be good to reserve the BUS ticket at least 1 week before.
You can just call the BIS Office and ask for reservation.
Normal ticket from Makassar to Rantepao Tana Toraja is around IDR 150,000 to IDR 200,000
There a lot of choises of high class buses from Makassar to Toraja (Rantepao or Makale)
It will take about 8 hours to arrive.
Prefererred departure time is 10PM at night so that you’ll arrive early in the morning in Rantepao/Makale.