Maastricht Bereikbaar will notify you about any such options from De Lijn. The season ticket fees charged by De Lijn are usually less than in the Netherlands. Furthermore, many municipalities in Belgium also offer an extra discount to certain groups of travellers.
If you have any more questions, you can contact our customer service on weekdays between 08.00 and 20.00 hours on phonenumber 043 - 799 94 09. Or by using the contactform.