Russians and other ex soviet countries kept manufacturing tubes well after the west stopped. They're often great quality military grade parts, a lot better than the Chinese remakes and fakes one can find at the usual online places. The same applies to germanium transistors and diodes, passive parts etc: excellent quality at very reasonable prices. Those who currently don't want to, or can't, buy from Russian sellers, can find the same items at various shops in western Europe: Bulgaria, Czech Republic, Ukraine (some shops still active and worth helping), Romania, Poland, etc.