So the latest release is the Zolo Liberty. Liberty+ will be released next month and will be Anker's first with BT 5.0.
If you're not looking at truly wireless, then there are several great options.
My highest recommendation would probably be SoundBuds Surge or Slim.
Surge are on sale for $19.50 with code XMAS3236.
Or there's the SoundBuds Life with neckband and super extended battery life (not sure why they're rated somewhat poorly; I have them and love them).