The are 5 different ways across 2 unique modes of transportation to help you travel from Bandeirantes to Bauru. If you're only considering the price, you should check out the bus out of Cornélio Procópio towards Bauru, as it is the cheapest to Bauru. It's common to find tickets for as low as $17. Viação Garcia operates from Bandeirantes to Bauru, so you book your trip with them! Book as soon as you can, as there may be limited availability.
On your trip from Bandeirantes to Bauru, 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.