Actually the best spiritual meditation practice is the simplest one yet very challenging for beginners. This is the Self-Inquiry Method of Advaita Vedanta popularized by Sri Ramana Maharshi and Nisargadatta Maharaj who achieved enlightenment after months of daily practice. It stands alone and doesn't require anything else which is very cost-effective in terms of time and resources.
A detailed description can be found at http://www.realization.org/page/topics/self_inquiry.htm
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