Nowhere, cellphones are made with planned obsolence in mind to get you to buy another in a couple of years. If you want something that last, get an old Nokia phone or a feature phone (these may not last longer but are at least cheaper to replace).

For the sake of honesty, I got a Motorola Moto E for $100 on Amazon two years ago and it's still rocking, even after many falls and abuses. Battery still last a full day of heavy use, I usually don't fear I will ran out even at 50%. But I wouldn't recomment it now because Amazon/Lenovo starting including lock screen ads in the device which are incredibly annoying, will suck your battery dry on top of the regular spying (I got it before they started this bullshit). If you're willing to get one, its best for you to install LineageOS on it, beware because unlocking the bootloader will void your warranty.

On my part, after my cellphone drops dead, I will go back to a feature phone. I only use as a handy camara, music player, alarm/clock, and browsing. A feature phone provides three of them and I don't really need to be connected on the internet.