Best ultrasonic brush with NO auto-shutoff timer?

I really appreciated the clear logic of this comparison, but ultimately I decided I couldn't pay good money for a brush that shuts off automatically after two minutes. As someone who routinely brushes more than two minutes, I just know I would find the shutdown annoying every time it happened. I do favor the ultrasonic over rotating models, so I'm wondering - what is the best ultrasonic toothbrush (for <$100) that does not shut off automatically after two minutes?
Thanks!

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