Smart buying buying a preamp with tubes anot avail except as made by preamp manuf?

Tubes if found are $300 per.  No inventory anywhere.
what if manuf discontinues making special tubes in a few years.  Resale value of preamp is low. 

@emergingsoul please cut to the chase and tell all who's the manufacturer and what tube.

What are you talking about?  C'mon man, you can't just post stupified posts about nothing!  if you have a problem with a particular manufacturer then make it known. If you are just doing silly high games then make it known! Don't waste our and the moderators time.

No way I would ever buy into that. Companies come and go… tubes require replacement.

@emergingsoul "...he is only person making the tubes?"

Really?