• Electronics: Try Usell.com. It aggregates offers from dozens of other websites, and it charges no fees to buyers or sellers. For a used iPhone 4, recent offers ranged from $100 to $140.
• Books/DVDs: Try Sellercentral.amazon.com. Yes, it takes a larger cut than other sites (99 cents per product plus 15 percent of the sale price), but its heavy traffic can help you find a buyer quickly.
• Gift cards: Try Cardpool.com. Which pays up to 92 percent of the value on cards from most major stores. Send in your card electronically and the site will mail you a check within one day.
• Kids clothes: Try Thredup.com. It will pay you up to 40 percent of the resale value of the item you’re selling. The site also covers the cost of shipping and sends you the mailing bag.