We have a mint condition Double barrel Bamboo Drone Flute made by Tito LaRosa. It's in B Minor. It's made in Peru by hand by local artisans/musicians. The double barrel allows you to play two separate notes simultaneously. Very unique and interesting sound.
I've included a picture of the mouth piece so you can see it's virtually unused.
Here's a link to a site that sells them. https://www.didgeproject.com/product/bamboo-drone-flute-la-rosa/
New they sell for $297 plus tax and shipping.
Ours is only $140 and you can't distinguish it from a new one from the maker.