Thanks for the watch~! <3 Hope you have a nice day! (Good taste in series 👌)
(Also to answer the "why are limited edition volumes so hard to find translated, I don't think the special volumes were ever translated, only the regular versions! The Caucus Race novels was translated but not the ".5" volumes as far as I'm aware too. As for doujins...just the age of the series I think makes it hard to find PH doujins in general nowadays! It's been 8 years since the anime came out, and the manga ended two years ago- but I wish you luck!)