The Path of Kriya Yoga as taught by the Self-Realisation Fellowship and Ananda Sangha are certainly worth investigating. The later technique by Dr. George King was received by him from an eastern Master of prominent standing. Dr. King adapted the technique so that it could be used by people in general rather than the more potent aspects of it which would be considered rather dangerous to the uninitiated.
No results in any field of endeavour have ever been brought about without sacrifice! Jedi Master, Dr. George King