I have the '23 NECs in soft cover, and the Handbook versions, and NJ has NOT adopted the '23 as of yet. We still use the '20 versions. 2020 was available in soft cover, looseleaf, and Handbook versions, and we have it legally available on the PCs,, IPads, and IPhones.
Cost wise, well over the equivalent of 600 Euros.
Now, we also have Fire Subcode with an extensive library of NFPA, Plumbing and Building guys, and IRC books.
A blessing was that earlier this year, the NJ Uniform Construction Code (NJ UCC) 5:23 et al, is no longer available in 'print' form, only electronically. Print was a subscription, and a fee for updates.
Then there is also an extensive library within the Construction Official domain, which is Administrative, including Multi-family, zoning, etc.