Its not worth it unless you're actually going to use it for something.
My brother made one, they're pretty simple.Buy some polymer clay.
It's so simple. If you can figure out shapes and how to hollow out a vessel, hurr you can make it.
Me and my bother found this tool on YouTube who played one of these.
$40? This very low for a musical instrument. My Annoying Orangeet, a mid range one, was like $1,700.