Amazon currently has the Sennheiser CX 300 II Precision Enhanced Bass Earbuds, Black for $18.16 w/ FS using Prime:
It appears to be the lowest price ever per CC. Pretty decent reviews all around for this pair of basic IEHs in your usual tech sites. Fakespot has this with an "A" review grade.
- Connectivity Technology: Wired
- Dynamic transducers deliver powerful, bass-driven sound
- 16-ohm impedance is ideal for use with cell phones, tablets and portable music players
- In-ear-canal design provides ambient noise isolation to improve listening experience
- 1.2 m asymmetrical cable with 3.5mm right-angled plug;the longer end goes behind the neck and into the opposite ear
- Soft silicon ear-tips (S, M, and L size included) to optimize fit for comfort and sound quality