a VirtualTourist member from Austin
Is it possible to purchase a Euregio ticket at the train station in Maastricht?
According to the Euregio website, you can purchase the ticket both at a counter at the Maastricht train station, from a ticket machine and from some bus drivers (not all).
An alternative and cheaper way that you might consider if you want to travel in the Dutch area of the Euregio ticket is to purchase a day card for the Veolia buses (including the ones to Germany). It costs only 4 euro and is sold in the bus.