I use the **** PT15 earbuds ($15, without cable) on a balanced MMCX cable, with my DP-X1.
The Daik DK-Song ($47, without cable) is another earbud with MMCX connectors. I also use them on the balanced output of my DP-X1.
Other than that, only more expensive earbuds are available with 2.5mm TRRS - unless you want to re-wire your own budget units with balanced connections - I'm seriously considering that with a couple of sub-$10 models, just for the fun of it.
I just bought the VE Asura 2.0 (2.5TRRS), which was $88. It's currently my favorite earbud/earphone to listen to.
The next step up in price, would be the Rose Masya ($110) with MMCX connectors, to use with your own balanced cable. There are also other, more expensive Rose earbuds, with MMCX.
The Yinman 600 ($142) has MMCX connectors.
The VE Zen (Standard 2.5TRRS) ($158) & (Black 2.5TRRS) ($358) have a tethered 2.5mm cable, like the Monk Plus and Asura.
The Shozy BK (Stardust) ($190) has a tethered 2.5mm cable.
Hope this helps,
David Baldock