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This is a tough one!
Although the book is readily available, a DVD or VHS version is not. The movie has not been released to DVD, so unless you have TIVO, DVR or can find the next time it is being shown on Showtime and can catch it to record it, you are going to have to wait until someone with the fore site to record it on their own to put it out there for sale.
Please let me know if I can help further.