Great success stories coming out of the SMU Entrepreneur Seminar. You'd have to be located in Dallas, though. When I took the course, in '05, it was $650. Well worth it, you write a business plan as part of the course and have access to their network of professionals to help you once the course is finished. They have both credit and non-credit options, too, so you don't have to be admitted to the school before taking it.
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Or you could just use the books they used. One was "The Portable MBA in Entrepreneurship" but, really, the course lectures and professional help were the benefits. Good luck!