It might seem odd to list the power supply that is intended for the CD555 on its own but it is the only component from the ‘exotic’ range that works with the more lowly siblings and it is available on its own.
If you have a CD555 and feel flush (!) then doubling them up is well worth investigating. For use with other components you need to buy a different burndy lead, but the NA 555 PS can be used with CDX2, CDS3, NDX, DAC, even the ND5XS. It is also very suited to the NAC-N272. We have a couple of them on permanent demonstration for this very reason.
One of our customers was moved to write this interesting user’s review: Naim 555DR PS we thank him for taking the trouble.