As far as i can see there is a train available which travels from the airport to
Amsterdam Central station, However, it seems there is a train which travels directly from the Airport to the station in Den Bosch.
There are trains every 30 minutes and they leave at 9 minutes past the hour or 39 minutes past the hour. This service continues throughout the day untill 11.39pm.
As far as the price is concerned it would depend on the seats available on the train or which train you take but i have a full fair quoted as 25.10 Euros for a same day return or a weekend return ticket.
I hope this helps