Both models of the iPad remain sold out or in short supply across the U.S. heading into the device’s launch in nine countries next week. Citing a note from Piper Jaffray analyst Gene Munster, AppleInsider reports that out 50 Apple retail stores contacted, 74% were sold out of all models of iPad, with the iPad with Wi-Fi available at 24%, and no iPad with Wi-Fi + 3G units available at any of the stores. The report notes that the shortages have been ongoing since the iPad with Wi-Fi + 3G’s launch on April 30. In response, Apple retail stores have begun placing interested customers’ names on a waiting list, which then sees the store hold an iPad for up to 24 hours when their name comes up. According to the report, the wait for an iPad after being placed on one of these lists is typically 4-7 days, besting the 7-10 days quoted on Apple’s online store. Apple will launch the iPad in Australia, Canada, France, Germany, Italy, Japan, Spain, Switzerland and the UK on Friday, May 28.