Series 1-3 may also be available at play.com for the same money.
However for those who prefer Amazon, then this is for you.
A team of scientists and military personnel is dispatched to a far-off galaxy to explore the remnants of the Lost City of the Ancients--also known as Atlantis--in this STARGATE SG-1 spin-off series. The Ancients were an advanced human race that initially created the Stargate network, and diplomat Dr. Elizabeth Weir (Torri Higginson) and pilot Major John Sheppherd (Joe Flanigan) head the international squad that is sent to investigate. The team arrives at Atlantis to find the city abandoned and their ship permanently stranded, unless they can find a power source to get themselves home to earth. They make contact with a brave but primitive native civilization as well as with the evil Wraith species. This collection gathers each episode from the third series.