Or you could try something like
this. These buds are already small, but the "youth" ones are smaller overall than the regular ones. Having said this neither one comes with a mic, but the youth ones don't allow you to change cables (must be too small to put in an MMCX connector). The good news though, is that they are only $18.
Also, there is the
TRN EMA, which comes with the option of mic or not (on a 2 pin cable), and the diameter of the face is only 14.2mm (rather than the 15.4mm standard size) for about $20.
And I am assuming that
@Ronion was talking about the
Apple Earpods?! But just in case, these have a built-in mic (though no changeable cable), and also come with a lightning connector (unless you get the OG ones). They are really small (are a semi in ear, rather than flathead), and don't actually sound horrid, for about $17. And even if they don't fit, there are some adapters that you can get to add ear wings to help hold them in place.
Or there is something like the
Ludos Nova buds. They are shaped much like the Earpods, but they also come with ear wings to hold them in place, a pretty nice-looking nylon coated cable, and are really cheap ($12).
That's all I got for now...
Edit: And don't forget that with the style of shell the the Smabat and TRN EMA have, you COULD always use a molded MMCX cable that makes them overear (for more stability).