Are you aware of any professional certification program at a discounted price? Any coupon to apply when buying an exam voucher? Any discount for students?

For example, I know that Neo4J provides certification at no cost. https://neo4j.com/graphacademy/neo4j-certification/

And Oracle has some Beta Exams at lower prices: https://education.oracle.com/pls/web_prod-plq-dad/db_pages.getpage?page_id=182