Storkbrokers.com is one of several sites designed for parents who want to sell or trade their baby stuff, “but don’t want to deal with eBay or don’t trust selling on Craigslist.” After a free registration, you can immediately begin buying and selling.
thredUP.com is basically an “online clothing swap.” To sell, members fill up a medium U.S. Postal Service box and list
its contents on the site. Buyers choose the box of items they want, then pay a flat service fee and shipping costs to receive the box.
SwapBabyGoods.com allows you to trade or sell baby gear online through listings. “Peruse the numerous categories” to find an item you’re interested in, then contact the seller to see if they would rather take payment for the item or swap it for something you’re trying to unload.
Source: Parenting.com