John Zink offers a course at their european HQ in Luxemburg.
I think it´s a 4 days course and the fee is something like 600EUR. Can say anything about quality because my boss didn´t let me go . . .
But included is the "John Zink Combustion Handbook" (750 pages) which I have actually on my desk.
If the quality of the course is as good as the book is the 600EUR are a good investment.
They might as well offer a course in the US if you´re american based.