I posted this as reply to another discussion about the same coarse, and some others I bought recently. As far as I can see, the "My favorite Universe" is still on sale at the cheap price of $34.95 download or $39.95 for DVD. Also, the "Life in the Universe" is shown in the August Catalogue for $84.95, not the high price of $254.95. I'm not sure why the web is showing the higher price. Some others are also on sale as shown below. I think the high "normal" prices are probably aimed at institutions /schools etc., and I think these can be shown to a large -public audience (Unlike your normal movie/documentary DVDs). I guess the special prices, when they come up occasionally, allow us "single" viewers to afford them also.
Life in Our Universe
http://www.thegreatcourses.com/tgc/c....aspx?cid=1898
Experiencing Hubble: Understanding the Greatest Images of the Universe
http://www.thegreatcourses.com/tgc/c....aspx?cid=1884
Cosmology: The History and Nature of Our Universe
http://www.thegreatcourses.com/tgc/c....aspx?cid=1830
My Favorite Universe
http://www.thegreatcourses.com/tgc/c...l.aspx?cid=158
Dark Matter, Dark Energy: The Dark Side of the Universe
http://www.thegreatcourses.com/tgc/c....aspx?cid=1272
Special Set Includes: (1) Understanding the Universe: An Introduction to Astronomy, 2nd Edition & (2) Skywatching: Seeing and Understanding Cosmic Wonders
http://www.thegreatcourses.com/tgc/c....aspx?cid=1855