I just took delivery of the Blon BL-03, which has a single 10mm carbon nanotube diaphragm per side:
https://www.aliexpress.com/item/33052121536.html
I ordered these before there were any pictures of them, just based on the description - lately I've been enjoying my single driver earphones a lot, and I was curious about this one so I took a chance. I need to spend more time with it, but my initial impressions are positive, especially for the price point. Packaging is a bit TFZ inspired, but contents are more budget like KZ. Build is a well finished, ergonomic metal shell. Cable is pretty good, though I'm using an aftermarket 8-core balanced cable right now. Stock eartips are an interesting cone shape, but they can take a wide range of eartips, and I've been trying every one I have... right now I think the RHA dual density silicone work well on them. I hope to have a full review done soon.