I just discovered yesterday that a new Commodore 64 power supply exists, and is shipped by a company in Poland. https://www.c64psu.com/ It has the same 7-pin DIN plug as the original "brick" power supply with a 5VDC rail and  9VAC rail. Should be a good investment for people who fear that a 30 year old C64 brick might fail and damage their SID chips in their MIDIbox SID / MB-6582. Also don't forget Altitudes idea of using high efficiency RECOM switching regulators in the PSU