Can't go wrong with the low-profile, neutral to slightly warm sounding (has tamed treble), and highly regarded Venture Electronics (VE) Zen LL (150Ω) aka "Sleeping Bud"I haven't read about earbuds in a long while and I would love for any directions or recommendations!
As for some sort of reference, I like the sound signature like the Hifiman HE-1000v1. Warm, a bit recessed upper midrange though without the piercing treble like on the HE1K. Bump in the bass is A-ok with me though as long as it doesn't creep into the lower midrange too much. I like the treble quantity to be at about where most of the midrange is with no crazy peaks. I'm thinking of using full foams.
Other things:
-Preferably plastic or lightweight earpieces
-Relatively flat-design so that when I lay on my side, it doesn't push into my ear. As a reference, the MX500 shell is fine.
-<150 USD
-Doesn't matter if cables are non-detachable though it'd be a bonus
Not sure if I'm missing a criteria.
This earbud's impedance is 150 so some will say it requires "amping" but I am not sure why as the sensitivity is 109 dB/mW and I did not find it difficult at all to drive from a mobile source (smart phone) when I listened to them awhile back at a mobile audiophile meet-up.

I nearly bought a pair myself but also had heard a pair of 500 ohm Puresounds at the same event and shortly thereafter settled on a pair of 600 ohm Puresounds instead that were simply divine to my ears. The VE Zen LL are on my "to buy" list along with the Yinman 600s.
Other options to consider are the Edifier H180, Qian39, or VE Monk Lite. The Qian39 are extremely comfortable if I recall correctly but it has been many years since I last listened to a pair.
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