There are two more on there
http://www.ebay.com/itm/STAR-WARS-HOLIDAY-SPECIAL-2-DVD-SET-1978-INCLUDING-56-KENNER-COMMERCIALS-BONUS-/161520952120?pt=US_DVD_HD_DVD_Blu_ray&hash=item259b662338
http://www.ebay.com/itm/RARE-STAR-WARS-HOLIDAY-SPECIAL-1978-HARRISON-FORD-CARRIE-FISHER-/191449244960?pt=US_DVD_HD_DVD_Blu_ray&hash=item2c9343a520
The second one has sold 6 in the last month alone