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Yes the 45, 67.5, and 90 Volt batteries are scarce these days. They used tiny cells and were not economical due to short life. Even shelf life was short. They were used in portable radios from most manufacturers, with those miniature 1.5 and 3 Volt filament tubes. There were a few instances where subminiature tubes were used but that didn't go over too well due to cost.
Nine Volt batteries indeed are inefficient use of space, with so much wasted due to spacers and all. Even the AAA, AA, C, and D are inefficient; they are cylindrical and much space is wasted around them. I think they should be rectangular in cross section but that was tried without commercial success.
Garage door openers used 9V for a while. Lately the emphasis has been on the tiny dime-like cells.
I don't disparage the Asian equipment; the stuff works well most of the time, and is a comparative bargain. My ham station is almost all of Asian manufacture, as are my stereo system and telephones. Most of my electronics test gear is US made, though. I do have one English signal generator and some meters from Asia.
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