Sorry. So long ago, I no longer remember. It's possible I got it from YesAsia. Otherwise, I probably googled for it.
ETA: Here's an Amazon link to what I have. It's got pretty minimal stuff on it. No extras, IIRC. Just a menu and settings (for language, etc.).
Dunno about your first question but I just answered your second question the other day here, yes you can buy Pyrophoric Cult, dunno where you're located but Amazon US has the Japanese bluray of it for around $70. Link here
The Japanese bluray is region A and has English subtitles. Whether it's worth that to you is your decision, it's pretty pricey for a 40min long OVA. And frustrating that it's not really available in the US any other way (AFAIK) considering there are important plot points in it to bridge the gap between Border 4 and 'The New Movie' (who thought that was a great name?). Arise is frustrating in general, I like it but man they made some bad choices making it.
It did. It wouldn't surprise me if it's out of print.
Here's an amazon link to what I have. Minimal stuff on the BD disc IIRC. Just menus and settings.