There are NOS tubes out there, but the supply is dwindling fast. It is important to buy from a reliable seller. I have had good service from Kevin Deal at Upscale Audio. NOS tubes come and go and when there are fewer tubes left the price goes up until they are gone. If you snooze you lose.
Tube sellers
I was just browsing the tubes for sale and I was noticing a disturbing trend. We also just had a thread about this on Canuck audio so it will be interesting to hear you Yanks take on this. What is your definition of NOS and what would your expectations be if you just purchased a NOS set of tubes???