The online consignment shop Swap.com takes some of the pain out of the resale process. You can print out a prepaid shipping label, toss in the toys and clothes your kids have outgrown, and drop them in the mail. The site’s staff picks and prices items. When your stuff sells, you earn cash (with a small service fee taken out). You can pay $5.99 to have anything that’s been rejected sent back to you, or opt to have it donated for free.