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This one [link] is the extended edition box set on Blu-ray, which includes a digital copy. It's the final box set that matches the LotR one, and includes all the appendices special features. Out November 17th
Either of these depending on what quality you prefer.
Yes, the extended trilogy is widely available as a single package. There's also a 4K version, but not everyone can play 4K content and apparently it doesn't include the extras (another 4K set is going to be released with the extras - and man do I really hate when they do that.)
I believe the extras on the blurays are over 30 hours long, so there's a lot to enjoy there. I found it all incredibly fascinating.
The Hobbit: The Motion Picture Trilogy (Extended Edition) (Blu-ray) [link]
Direct Link: [link]
Here it is:
Amazon dropped Hobbit today (down to 45 USD). [link]
It's back: [link]