Should I sell my iPhone 4s on Amazon or Craigslist?

Amazon is offering me $410 gift card. But I don't think they even sell the iPhone's only resellers. On craigslist 300 seems to be the "buying" price I have a 16gb White Verizon iPhone 4s btw. 300 seems lowish… Should I just do one of those other trade programs? I don't know I wanted 400, I included like 4 otter box cases and a glif for the craigslist ad but meh what would you guys do, or what are you doing with your iPhone 4s?

Give it to amazon and then trade the gift card with someone for the money

Amazon