I've always purchased my iPhones directly from Apple since they started selling factory unlocked phones. I don't use eBay because of a few bad experiences and have used Kijiji and Craigslist and although I get buyers fast and with any hassles, I get short changed a lot. I sell them with cases that I have and I usually have a few that range from $50-$100. Not to mention that the phones are in great condition. Just to test things out I put my iPhone 6 up for sale (tempted to get a 6 Plus) with three cases. I set the price to $950 and everyone wanted to banter and the highest price I got was $800. Any tips would be much appreciated.