The are 3 different ways across 2 unique modes of transportation to help you travel from Araguari to Barra do Garças. If you're only considering the price, you should check out the bus out of Araguari towards Barra do Garças, as it is the cheapest to Barra do Garças. It's common to find tickets for as low as $50. Rotas do Triângulo operates from Araguari to Barra do Garças, so you book your trip with them! Book as soon as you can, as there may be limited availability.
On your trip from Araguari to Barra do Garças, 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.