Tech-focused brokerage and referral site Redfin is hoping to rustle up listings with a free tool that allows homeowners who are contemplating putting their property on the market to poll potential buyers, via a Redfin agent, about their interest in the home at a specific price. Homeowners who use Redfin's "Price Whisperer" tool get simplified feedback from up to 250 homebuyers polled by a Redfin agent that reveals how likely they could sell their home at the price they tested. Homeowners who use the tool -- which Redfin rolled out today in Boston, Chicago, Los Angeles, New York, Portland, Ore., San Diego and the San Francisco Bay Area -- are under no obligation to sell their home or work with a Redfin agent. "Price Whisperer was created to get Redfin customers top dollar with less...