Been there. I have a beautiful working L1200, but for a month, the seller "couldn't find the power supply". I searched the earth for one. But he finally found it.

So, finding the power supply is a pain; rare, but not really that expensive

ebay can be a source for parts, but, rare. there is a regular ebay seller of Durst stuff,

These guys sell new parts, but very expensive:

But once you got it working, it is a wonderful enlarger, so easy to use.