Trusted tubemeisters

Hi Everyone!
Just upgraded my Nick Doshi pre/phono and power supplies to MK2 status.
He gave me a list of his preferences in tubes for each...
Some are easily found, others harder and some may be impossible!

I have never been a "roller" so i have no idea of what individuals or companies that sell these are trustworthy as to price and product.

Can you please offer time trusted people who may, as a bonus, have access to the harder lines to find?

Thanks to all!

Azjake