Robert Anton Wilson said that "reality is a constant negotiation between the observer and the observed." When I sit down, I hope that my chair is understanding my expectations to have it observe certain Newtonian laws.

In a live class of any sort, the teacher is both the observer and the observed. In a recorded class, be it recorded on video, audio, or simply text, the teacher is innert and cannot rapidly adjust to the needs of the student.
I'd consider a live seminar, although I have confidence in my current level of abilities. It is expensive, but the cost is on-par with the cost of learning software at a company I used to work with. That is to say, what they are charging is rather standard, even if they are teaching something rather unusual.
The best way to get something like this paid for is to have your place of business swing it out of its education budget. For most people, that is not going to apply. It is also possible that the company can reserve an in-house training. The question is on the value of the skill, and how it relates to one's job. Every job requires literacy, but not all place equal value on it.
Hope this helps.