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I that the antique electronic supply catalog had some 67V ones a few years ago. Never seen them stocked in stores. But my memory of stores only goes back to the early 90s...
Larger American portables usually have enough room for a series set of 9V batteries to approximate the original B battery.
On smaller coat pocket radios I've been thinking about getting lots of cheap 3V coin/button cell batteries and stacking them in a plastic tube with terminals on the end...it should be possible to get plenty of voltage in a small package that way. Most tube radios had miniscule B+ current draw so that approach should work.
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