Radio Iowa: Iowans who are trying to rebuild their homes after the Aug. 10 derecho are finding it very difficult to find certain supplies, from fence boards and two-by-fours to refrigerators and toilets. Jay Iverson, executive officer of the Homebuilders Association of Iowa, said lumber prices were rising even before the powerful storm hit, partly because of trade tariffs. But also, Iverson said: “Supply and demand is a bigger part of the problem, especially with the states that were closed down with the virus, including construction. When those opened back up, it really started pulling a lot of those resources.”