There are also quite a lot of carrier locked retail phones, mostly at that price point for prepaid. They tend to be no better than the comparably priced cheapie unlocked phones, but they are quite readily available at big box discount stores like Walmart and Target vs. requiring going online. I haven't looked into whether they're readily unlocked in years, given how easy it is to get decent ones online, but then again my price sensitivity isn't big enough that the difference between a $60 phone and a $119 Moto E4 would be worth the research to find a non-junk $60 phone.

There are also occasionally clearance name brand phones.