The are 5 different ways across 2 unique modes of transportation to help you travel from Aparecida to Barra do Piraí. If you're only considering the price, you should check out the bus out of Aparecida towards Volta Redonda, as it is the cheapest to Barra do Piraí. It's common to find tickets for as low as $14. Viação Sampaio operates from Aparecida to Barra do Piraí, so you book your trip with them! Book as soon as you can, as there may be limited availability.
On your trip from Aparecida to Barra do Piraí, 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.