Thanks to wonderful colleagues and friends from around the world, there is a abundance of guided meditations available for free. Below, I provide links to some great resources from the University of California, San Diego (Center for Mindfulness) and UCLA Mindful Awareness Research Center.
15 Minute Awareness of Breath by Lois Howland
20 Minute Body Scan by Steve Hickman
45 Minute Body Scan by Steven Hickman
45 Minute Body Scan by Cassondra Graff
45 Minute Mindful Movement Lying Down Postures by Lois Howland
45 Minute Seated Meditation by Steven Hickman
40 Minute Mindful Movement Standing Postures by Livia Walsh
If you are interested in deepening your knowledge of mindfulness meditation, consider reading Ken Lunn's MBSR Workbook. Ken has made this resource available free of charge.