For anyone interested in learning vipassana meditation at no cost, you should consider attending one of the 10-day Goenka (a Burmese industrialist who has helped spread vipassana mediation around the world) vipassana retreats held around the world. You can learn more about the retreats and vipassana here: http://www.dhamma.org
The retreats, are a very effective means of aquainting oneself with vipassana meditation. Vipassana is something which must be experienced not read about. The retreats not only teach you how to do vipassana, but they explain to you the underlying Buddhist theory/philosophy as well. The emphasis, is however, on the mediation itself. The theory is simply skillful means to help you understand and interpret what you experience.