Interweave has a Plein Air Painting video for $0.10 until Next Tuesday.
It is a download: Artist Daily Workshop: Mastering Plein Air in Oil with Frank Serrano - Download
But you say, I don't do Oil Painting.
I have to say it is $0.10. Ten Cents. If you come out with one technique you an apply to your chosen medium don't you think it is worth it for Ten Cents?