You could buy either the DVD set or the Blu-ray set. The Office is also available on both formats. Babylon 5 is unfortunately not available om Blu-Ray. It has been remastered in 4x3 HD for streaming services and iTunes, but I’m afraid it may never be released on Blu-Ray. The story I’ve heard is that the CGI and other digital effects were done in 4:3 because it was quicker and the files were lost in a warehouse fire. Though, I have to believe someone has them. I can’t imagine that the only copies were in that warehouse. I would think someone would have made copies for a “rainy day”.