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Marshall Vandruff's Perspective Course
Marshall Vandruff is a ubiquitous name in art instruction - not just through his work on the Draftsmen podcast and his other collaborations with Proko, but in his own right. He's been teaching anatomy, gesture, and perspective for decades, and a number of my own friends have taken his classes at the Laguna College of Art and Design (back around 2010), and had only good things to say about him. Not just as an instructor, but as a wonderful person as well.
Many of you will be familiar with his extremely cheap 1994 Perspective Drawing lectures, but here he kicks it up to a whole new level.