I was going from
DripElectronics.com • View topic - costs /materials
And assuming components like metal film resistors (which I prefer) and no NOS tubes (which I can't afford).
A case from Purusha is about $100.
You're right though. Unless you skimp on the transformers I think it might come closer to $1300 or maybe $1200 but I haven't done a close look.