Just posted on Orthotropics YT channel: $20 - https://squareup.com/store/letsfaceit/item/gopex
I am totally writing now this, he talks about it having exercises and routines for good posture orally and is one of the top practitioners of OT in the world :)
https://www.amazon.com/GOPex-Good-Oral-Posture-Exercises/dp/0996334947
judging by the reviews it seems like a very simple picture book intended for parents to teach their children. probably not very useful/profound for someone like you or I, although there are zero preview pictures so I'm not certain
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