“Mastering Vray” is a fantastic online course - around 10-12 lessons provided via a subscription. It is more of an advanced vray course, but made by Grant Warwick (Sydney).
Otherwise there is the Vray training material on Viscorbel.com. The instructor, Austris, is one of the most talented Vray users.
If you have a solid foundation of 3ds max and a basic understanding of Vray, watching the Viscorbel tutorials + Grant’s Mastering Vray course will turn you into a master. And the total cost you will pay for these online lessons will be far, far less than an institution.