I bought some pretty awesome and tiny bluetooth earbuds here in HK for about 30usd. They look like a lipstick when charging, but they work really well for me. I use them one at a time, while the other is charging. They secure to the charger with magnets and have small springloaded connecters.
Pics here: https://drive.google.com/open?id=1KFWkCamye4eWjuJJlXTrh19UyAxz8WAp