Confused about US dvd releases

[x-drear-x.livejournal.com]

Hoping this is tagged correctly.

So a few months ago I bought Bandai's special edition boxset, the one that came with manga, cds, sexy booklets, etc and dvd volumes 1 and 2. Wondering when the hell disc 3 was out, I ran a search on the site I bought the boxset from and got these results.

I see a Part 3, a part 3 special edition, and a S1 volume 3.

Does anyone know anything about these volumes and parts? The parts are more expenisve, but does that mean they come with more extras or something? All I want is the 3rd dvd with the special features on it.
Appologies if this seems like a retarded question, but its pretty expensive to import american dvds, and I want to make sure I don't end up buying the box set again by mistake. Google has failed me, could anyone help out at all with this? Please ;_;

Comments

[x-drear-x.livejournal.com]

Thank you, just ordered the special edition. So expensive, but never buying DVDs is my excuse .