I bought the TCL SOCL300 for around Rs. 400 ($5) from Amazon India.

The earpiece is super tiny and it sounded very weird on first listen with stock M-size tips. Everything seemed to be imaging to the right. I thought it had a channel imbalance so I measured them and it turned out to have great channel matching. Turns out it was a seal issue and going up to the stock L-size tips solved it.
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