The deal on I-III is better, but the IV-VI is good if you missed BF:
Star Wars: The Prequel Trilogy (Episodes I - III) [Blu-ray] (2011)
Star Wars: The Original Trilogy (Episodes IV - VI) [Blu-ray] (2011)
Star Wars: The Prequel Trilogy (Episodes I - III) [Blu-ray] (2011)
Star Wars: The Original Trilogy (Episodes IV - VI) [Blu-ray] (2011)