I've recently bought these IEMs from Temu, because it was just like $3 and it was from a brand I didn't know and curiosity took me over: KCKZ S72:
These are the worst IEMs I've ever used. A shit ton of bass, muddy mids and scratchy trebles. Bass is overwhelming, and I'm not ever exaggerating.
There are some decent ChiFi IEMs at this price range: KZ EDX Lite, KZ EDC, QKZ AK6 etc
I've literally took it out and broke it after 15 secs of usage.
There was also this model, these were even cheaper ($2.95 ish), called KCKZ s72.
I found absolute Zero information about these IEMs.
As you can guess, this is also crap, but looking quite cool!
I can suggest QKZ AK6 as a cheap entry to IEMs if you like V shaped sound profile (which I don't).
Also, none of these come closer to Tangzu Waner SG, Moondrop Chu 2, or 7HZ Crinacle Zero 2, or even KZ Saga.