As a student of Wageningen UR, VHL and other universities, it is possible to buy student sports rights per month. This is possible since the 1st of August 2014. Costs are € 11,50 per month. These rights are available at the information desk of the SCB (cash or pin).
How does it work? For example, you buy sports rights on the 6th of January for two months. Then the sports rights are activated on your card from the 6th of January till the 6th of March.
If you want sports rights again for a month when it is the 3rd of May, you can buy sports rights from the 3rd of May till the 3rd of June.
(Pay attention!! Sports rights for a year are much cheaper than per month! Also you can buy your sports rights for a year online via iDeal).