The are 4 different ways across 2 unique modes of transportation to help you travel from Apucarana to Barretos. If you're only considering the price, you should check out the bus out of Londrina towards Barretos, as it is the cheapest to Barretos. It's common to find tickets for as low as $47. Viação Garcia operates from Apucarana to Barretos, so you book your trip with them! Book as soon as you can, as there may be limited availability.
On your trip from Apucarana to Barretos, it is best to book as soon as possible. It won't necessarily help reduce your price by a large amount, but will ensure that you have a spot on the bus or train.