Finding BL, RB1, and RB2 JPN copies on the web wasn't an easy task, but I eventually came across a method where I was able to acquire the files.
Website with PS3 Games: https://romtohome.com/ps3/
Premium Link Generator: https://alldebrid.com/ (requires a mobile number for a 7 day premium trial)
I am grateful HitFile still has the files active, but trying to charge almost $10 as the cheapest option? Come on.
Note 1: _Budokai HD_ was not released in Japan (although the EUR version is the one to go for if you want Japanese audio with _B1_).
Note 2: _Battle of Z_ and _XenoVerse_'s EUR/USA prints are identical to the JPN, I think, so that's why I didn't include. I mean, even _Burst Limit_ is too, but this game is awesome.