Been buying seasons of DS9 on iTunes, it is incredibly less than buying the DVD box sets. Too bad there are no special features, but if your interested in just watching the show its a great deal. Season 5 was just added, but you can only purchase the single episodes, apparently there was some trouble with one of the episodes and it is missing from the list. I heard that once it is added back they will offer the full season for 12.99. On season 2 but have seasons 3 and 4 in the wings.