On Amazon I can buy an electric toothbrush for $40 and an Echo Dot with Alexa for $50. So for $90 I can get the equivalent to Wavee's "electric smart toothbrush speaker" for which they're charging $279.99 ("suggested retail").
I'm willing to bet you can also buy a decent 3D printer kit with included filament/resin, print a case for your Blue-thbrush Frankenstein's monster, and still be under $280.
Edit: yep.