Agreed, KZ is honestly the best brand for quality cheap earbuds, they have no reason to sound so good and yet they do, I personally own the KZ ZSN PRO X's and they sound fantastic only costing me about £18 (~$20) they are a bit bright though for my liking but its nothing a simple bump on the low end with an EQ can fix...
If I where you I would buy any of the KZ IEM's listed on their amazon page like the ones mentioned above and then buy the KZ bluetooth adapter which will only cost you about $25, it is true they wont have any fancy features like ANC or touch controls but if you only care about audio quality, it's your best option.