Reliable bulk source of US-purchased iPhone's

Hi all,

Curious where someone can acquire 100-500 used iPhones in bulk.
iPhone 8 (and above) or SE2 (and above) are what we're looking for.
Phones must have been purchased in the US, UK, AUS, or Canada.
Phones are second-hand from normal people, and not used previously for black-hat stuff.

Ideally the source can provide more phones when needed.
Open to pay a broker if they know a good source too.

Cheers darlings x

OfferUp usually has posts of older phones, and the posters are sometimes cell phone stores that sell them in bulk