Slater
Headphoneus Supremus
For inexpensive with just a slight V instead of the more typical deep V under $50 IEMs I recommend either the TRN V20 or Yersen FEN-2000 both of which are under $30. The TIN Audio T2 is around $50 with cable under $40 without in case you have a spare MMCX cable to use.
In case people are willing to wait for the Ailexpress sales that happen a few times a year, I paid $27 for my T2 during the anniversary sale.
They are also around that price during 11.11, and other times (black friday/cyber monday, and I think 1 other time maybe around July for some other holiday/sale).