What is average price of used iPhone 4?

I want to sell my iPhone 4. How much should I sell it for. I've lost the box but have charger and earphones. No scratches at all. 8Ghz. I gifted my previous one so don't know what's a better place to sell eBay or somewhere else?

I'd recommend Ebay, people go crazy on there for iPhones. Probably get about $400 - 450 for it.

They really don't go for $400 like that other guy said. They average for about $220 for an AT&T model. For Verizon iPhone's they sell for about $175-$185. Please also consider the fees that ebay charges.eBay charges 10% of final sale, and PayPal charges 3%. I suggest using TriPhonia.com
They pay close to that without all the fee's and hassle.