[mrsteveman1]

Gazelle [1], because I upgrade every 2 years, and they pay me enough for a 2 year old iPhone to cover almost 90% of the cost to upgrade.

Sure Gazelle likely turns around and sells it for 1.5-2.0x what they pay me, but they're very fast, reliable, they send real bank checks for the full amount rather than AT&T or Amazon store cards or prepaid debit cards, I don't have to deal with anyone else (individual buyers on Amazon marketplace or eBay, or worse: locally), and most importantly I don't have to spend more than a few minutes on the whole thing, which is more valuable to me than the minor additional money I could get selling it myself.

[1] https://www.gazelle.com