I believe most of the H3's that were available were sold in Europe. They just recently became available in the US. Adorama now shows them in stock and B&H Photo has them on back order.
I honestly don't look for high sales volumes in the US. The $2600 price is considerably higher than the H Plus with very little improvement (if any) in flight or photography.
Not much happening with the H3 pilots? There was achap who posted some shot of his H3 some time ago but he's been silent since. As far as I can remember he is from the US. It could be the lockdown not sure but I would like to see some photos and comments on its flight characteristics compared to the H Plus?
I was on the chat site with Adorama discussing the H3. I ask about customer service and if Yuneec USA was out of bankruptcy. We were then mysteriously disconnected. Hummm. Looks like the H Plus has been discontinued.
If you look at @hexa reply you will see he is from Belgium in Europe where the H3 has been available and there is still Yuneec CS. His English is understandable. More unfounded attacks on a fellow member of this sort will result in moderator action.
Being upset with Yuneec USA is one thing, but taking it out on other members is another. You have used your one free pass!