Just to clarify, are you talking about 'earbuds' or "in-ear-monitors" ?
For IEMS, there's a few extensive threads over at head-fi that talk about stuff in the sub-US$100 range. There's one that talks about the obscure, Asian origin brands.
Likewise for the earbuds.
For IEMs, I cannot agree on the Marshall's on Wirecutter's list. They are really at the back of the heap in my experience.
In short the current "hype train" for not-so-mainstream IEMs over at Head-fi seems to be centered around a few in order of price (highest to lowest):
BGVP DM6, Kanas Pro, BGVP DMG, CCA C16, BQEYZ BQ3, KZ AS10, KZ ZS7, CCA C10, KZ ZSN. ( US$199 -> US$16 )
As for earbuds, the only "serious" one I own is the ToneKing TO600.