just go to balletone.com
It looks as though one can start with a workshop, but to be ‘official’ one does a 6 hour training with an exam. I couldn’t find any pricing for those workshops, but there is an online self study thing you can order for about 150 dollars.
I see what you mean…. it has elements of several popular styles of exercise: core, pilates, barre…. and it is less known, so you might find it a less overexposed niche market. And it might work well with your dance background.
I don’t like that they have their advanced level of training end with putting MBA after their name. It sounds too much like a master’s degree, and I think that can be confusing. But that is a pretty picayune complaint all in all.