Where to find the 1950’s Edition of All & Everything
If you are looking for a copy in English, these are two good choices in the US.
This is the US paperback version and is very reasonable.
This is the US hard cover version and is also very reasonable http://shop.tworiversfarm.org/shop/
The price is quite reasonable and we can get it within Europe via the European amazon-sites (f.e. in Germany, UK, France, Italy, etc.) without great costs for the postage. You can find the 1950-version online at several places
The German version is quite expensive with 90 €. Sometimes one can find an old version for a good price at www.amazon.de or www.booklooker.de . One can find a pdf at scribd.com – well, this is a illegal one, because the copyright is still under legal protection, because the translator Mrs. March Göpfert passed away 1987. Concerning the translation into other languages I have no overview. https://www.find-more-books.com/ is a good search engine for used books. https://www.abebooks.com/ could be helpful as well.
Three links to the Dutch translation of the 1950 version (new books): https://www.bruna.nl/boeken/beelzebubs-verhalen-aan-zijn-kleinzoon-9789062715275 https://www.bol.com/nl/p/al-alles-eerste-serie-beelzebubs-verhalen-aan-zijn-kleinzoon/666776126/ https://www.boeken.com/beelzebubs-verhalen-aan-zijn-kleinzoon-246075/
Apparently, it is out of print now but in June 2018 they will be available again.