I'm not sure which models you'll find for your exact budget, but check out Xiaomi phones, they are excellent quality phone and compete with flagship models from much larger brands at prices between $2-400 depending on the model you choose to go with.
For example, the Redmi Note 8 can be picked up for under $250.
I have the Mi 9t myself and it has been amazing. It packs in features that are usually found in recent flagship models from one plus etc, amazing camera, fast, responsive and reliable and ridiculously good on battery life.
Alternatively, try looking at refurbished handsets for a huge discount or older models of more recently released handsets. If you're not too fussy about having a brand new sealed in box handset, you can pick up some great deals this way.
I only bought refurbished handsets for years after breaking free of phone contracts and never paid more than $200 for phones that were flagship models from the likes of Sony etc, yes I was 6-12 months behind the latest trends, but I got a quality handset at an unbeatable price and they were always in such pristine condition that you wouldn't be able to tell they weren't new (they are usually open box returns that have never been used).
