SAGE has an agreement with VSNU Netherlands institutions, which is running between 2020 and 2021. The details of the deal are as follows:
Subscription journals which offer SAGE Choice: The articles of corresponding authors from various VSNU Netherlands institutions can be made open access through SAGE Choice, SAGE's hybrid open access option, free of charge. Charges other than the author article process charge (APC) may still apply, please refer to individual journal submission guidelines.
Gold open access journals: Corresponding authors publishing an article in a gold open access journal are also entitled to a 20% discount on the prevailing article processing charge (APC) for that journal. Click here for the participating Gold journal title list. This discount will be applied automatically in the SAGE Open Access Portal. Where an author is eligible for more than one discount, discounts cannot be combined but the highest discount available to the author will be applied to the APC due.
For more information on restrictions and to see how to redeem your VSNU offer, please follow this link and find the SAGE section: http://www.openaccess.nl/en/in-the-netherlands/publisher-deals.