. >> reporter: chris and candice rodgers wanted to move to a bigger house.with las vegas homes costing about half what they did during the housing boom, they figured it was the perfect time. except there was nothing to buy. >> we looked at a lot of the existing homes and some are bank-owned. >> reporter: so the rogers turned to new construction, which is suddenly sprouting up all around the city with national and local builders alike coming back to what was, until very recently, a ghost town of unfinished lots. as for the rogers' old home, rather than sell it at a loss, they rented it out. >> rental reduces it 40%. >> reporter: the rogers are a big part of why supplies of homes across the nation are so low. few want to sell at the bottom, while millions of others are still under water. >> the overall economy has gotten better. the buyers understand now that these low interest rates are a real dramatic opportunity for them. and most of all, the resale inventory is dried"çup. >> reporter: and not just in las vegas. nationally, the number of homes for sale toda