(HAR Report): The sluggish pace of new listings combined with another month of strong sales drove single-family homes inventory down to a 2.5-month supply versus 3.9 months a year earlier. The last time inventory dropped that low was in December 2014. For September, however, new listings saw a 7.0 percent year-over-year increase. Housing inventory nationally stands at a 3.0-months supply, according to the National Association of Realtors (NAR).