Yeah, I think the AI-thinker one is certified - but it's the only one I've seen. They seem to be on absolutely everything :)
I did wonder about BGA - it's good being able to hand-solder the prototypes, but also I'm a little worried that with BGA I might have to move away from 2 layer boards, which would again add a bit to the price.
But yes - doing BGA would really shrink things down, and would give a wider selection of processors. I might take a look at it for the small, cheap board - where the routing should be as simple as possible.
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