Jabees Firefly and Firefly Pro seem promising as budget options for ambient sound - ine should be arriving next week. I did briefly listen to Firefly while at a store in Taiwan. I think it only had SBC or otherwise didn't sound very impressive, but part of this was because I was floored by the Astrotec S60's sound. I can't recall much about the ambient sound's quality though. I've been told the Firefly Pro has a number of improvements but the sound is mostly the same as the original, but you also get a Qi charging case. Mifo O4 is another option which will have ambient sound as well as Type C and wireless charging. I find Jabra 65t's ambient sound to work well but it has a tendency to cut or disconnect 20 seconds or so as if it is difficult to keep a constant mic feed. The ambient output is also rather tinny, compared to my MDR-1000X which has a much darker and realistic ambient sound.