So you want to watch the show?
Crossing Jordan is available online at several locations, such as Ebay and Amazon, and in some stores, but supplies are limited because of the time that the show ended. Season 1 seems to be the only available at this time.
NBC announced in January 2007 that it was making progress securing music rights to allow the show to be released on DVD. (Crossing Jordan relies heavily on pop music in its soundtrack.) The first season was released on DVD on May 6, 2008 and there is no notice of substitution of music on the DVD packaging. However, as of April 2012, the latter seasons were still not available via DVD.
Also, you can google and sign up for paid and free streaming websites, such as the well-known http://www.Netflix.com.
UPDATE: It appears seasons 1 - 6 are available on DVD or at least on Amazon here: http://www.amazon.com/s/ref=nb_sb_noss_1?url=search-alias%3Dmovies-tv&field-keywords=crossing+jordan