Reddit mentions of Attack on Titan, Part 1 (Blu-ray / DVD Combo)

Amazon.

For US

It's great to see that you're interested in supporting the studio! I'd suggest you order from amazon. They're very reliable about their deliveries and they are certainly legitimate. Hope this helps!

If you're talking about the box sets, I believe "Part 1" is episodes 1-13, thus "Part 2" being the latter half of the season.

The standard edition should suffice if you just want to watch the series.

Here are the box sets standard edition:

(PART 1) http://www.amazon.com/Attack-Titan-Part-Blu-ray-Combo/dp/B00FXB8RRO/ref=sr_1_1?s=movies-tv&ie=UTF8&qid=1406341485&sr=1-1&keywords=attack+on+titan

(PART 2) http://www.amazon.com/Attack-Titan-Standard-Edition-Blu-ray/dp/B00KU3Y2VK/ref=pd_cp_mov_0

Not sure if this is English dubbed or Japanese with English subtitles, but according to Amazon the languages are English/Japanese so I would think you could select which language. Don't take my word on that though.

The limited edition (fairly more expensive) comes with:

• 3-D Lenticular Art Card
  
  
• Notes From Beyond the Wall: Part 1, a 24 page digibook packed full of art, character information, and 4-panel comics
  
  
• 104 minutes of on-disc extras including: The Making of Attack on Titan, Chibi Theater: Fly, Cadets, Fly! Days 1-13, Episode 3 & 13 Commentaries, Eyecatch Gallery, Textless Songs, Trailers

iTunes, PlayStation Network, Amazon. Blu Ray, each part has 13 episodes

http://www.amazon.com/dp/B00FXB8RRO/ref=wl_it_dp_o_pC_nS_ttl?_encoding=UTF8&colid=3KGXMO8ZEYXIU&coliid=I1HW8446JFAMVR

Only missing the E. Happy Cakeday!