As the mortgage crisis drags down prices across the country, homeowners can squeeze additional tens of thousands of dollars from the sale of their property by becoming their own agents. "If you cut out all agents—meaning post your own online ad, put out a yard sign, and sold your home on your own - you would essentially cut out on average about 6 percent of commission," says Greg Healy, vice president of operations at ForSaleByOwner.com, a Web-based company that markets the homes of independent sellers. "On a $300,000 home, that's about $18,000 of savings."