Chosha: Godly unit, or military academy bug?

[Puce Moose]

I've always wanted a lovable Chosha unit or 76 (what my leadership will allow) for my very own, but sadly have never found any to recruit in Reha. To my delight I discovered that the military academy will let me train gobots into Chosha; but at a terrible price; over 800 trophies per Chosha! Considering that each battle seems to yield 100-400 trophies, this seems like a *steep* price for a single Chosha.

Is the academy the only way these units are available, or do they sometimes show up for hire? I've accumulated about 14,000 trophies over the last twenty hours of play, clearing multiple islands - are 17 Chosha worth this exchange, or is this a price bug/oversight?