Good ways to sell iPhone 6

[Barcafan89]

im considering selling my iPhone 6 plus to get a rose gold iPhone 6 plus can roughly sell mine for 200 -300 quid my contract buy out is somewhere between 300-400 my iPhone is in mint condition moreless how should I go about selling it for a good price?

Thanks

 

[clunkmess]

eBay!

 

[Mac'nCheese]

Gazelle is easy to do but I think people can get more if they sell it privately on eBay or Craig's list or something similar like that.