Don't know whether it's a bug or not, but the trophy requirements for training units in general seem a little too steep to make that feature really useful. I suppose it also depends on your character class and difficulty level; maybe a mage (whose lower leadership doesn't allow huge armies anyway) on Impossible (where enemy armies are bigger and you presumably accumulate trophies faster) would have more use for it.
As to the availability of choshas, you could use the save game scanner to see if there's anyone selling them.
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