Good place to start is the budget IEM realm. Competition has been crazy intense recently and the entire sub-$100 price-range has been completely overturned several times at this point.

Currently some picks are: Tangzu Wan'er $20 - Slightly engaged neutral

7Hz Salnotes Zero $21 - Neutral

Truthears Hola $18 - Warm tuning, relaxed treble

Truthears Hexa $80 - Warm, great details

Heart Mirror Pro $80 - Fun, V-Shaped

Truthears Zero x Crinacle $50 - Harman

QKZ x HBB Khan $40 - BASS, but clean