Best mouthguard for BJJ? Tired of the boil-and-bite garbage

I've gone through 4 boil-and-bite mouthguards in 2 years. They never fit right, they make it hard to breathe, and they always fall out when I'm talking between rounds.

Is it worth getting a custom mouthguard from a dentist? Or is there a mid-tier option between the $5 drug store ones and the $400 dental ones?

I got hit with a knee to the face last week during a scramble and it convinced me that dental bills are more expensive than any mouthguard.