I stopped giving tube advice when the Ukrain war caused tube prices to double.
Having said that CP tube choices are narrow at best.
I always had luck with Russian PT's & NOS pre's but i haven't really bought anything other than NOS all the way around the last 10 years.
Doesnt really matter "where" you buy as CP tubes are all the same shit either Russian/Jina/ or Slovak. [jj]
For everything JJ, buy from EuroTubes Directly. Amplified Parts is in the USA and ships international as well but shipping may be high and pay duties as well.
Doug's Tubes (USA).
The Tube Store (Canada) but I've learned they don't test their tubes.