From everyday's hassle free Gazelle to sometimes can be creepy craigslist, everyone is all about getting the bets bang for their used item. As new entrant to the market, Sold is here to make it that much easier for us all. Check them out! They just released an app for Android and has had an iOS app since their launch in April.
If you missed it a couple of months ago, Techcrunch first reported Sold back in April here.
update: the first item I put up on Sold was a pair of Tokidoki Sol Republic Headphones that retail for $120 and the offer I got was $53. Seems reasonable for a "no hassle" sale, but I'm thinking that it's utility is worth more. It's actually unopened as well. Once you receive an offer, in my case 72 hours later, you have 24 hours to accept and being the transfer. I have 12 left to decide.