Did all the tubes disappear or something?  LOTS AND
LOTS of tubes were
 made during their heyday.  I know a few people who have hundreds, and in one
 case thousands of tubes, and I've got a few dozen myself.  Don't be
 paranoid, Ben. ;) 
I am down to about 10,000. At peak, I had roughly 40,000.
And I am small potatoes...
Some tubes did disappear. I pity the man that wants to get a power
supply for an IBM 709 up and running. C16Js, in used UNTESTED
condition, go for a few hundred bucks. If you can find them.
Same with anyone that gets a computer using 6386 dual triodes.
--
Will