[Ditto]

And why have Zagnut bars become so hard to find?

The plant in Pittsburgh where they were made closed about 10 years ago. Some other company bought the brand, but it's been a while since I have seen them too. I don't know if, or how widely they are marketed now.

I do know that with the high US sugar tariffs, it's tough for domestic candy makers to compete on the world market.

[Ciexyz]

Clark bars used to be made in Pittsburgh, too - prob. the same factory that made Zagnut. One of my coworkers used to bring in boxes of those candy bars because her husband worked for the company.