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Marshall Vandruff's Linear Perspective Videos
Despite their age, Marshall Vandruff's videos on Linear Perspective are some of the best lectures on all the ins and outs of perspective, and as an instructor, he is highly respected across the board. He goes into a lot of the intricacies that I don't touch on in much depth (at least, not if I can help it).
On top of being some of the best, his lectures are also among the most accessible, at the full 8 hour set for $12.00. There's literally no reason not to grab them.