The Wall Street Journal reports (paid subscription required) that major retailers across the US are having trouble with iPod shortages this holiday season. “Many of the most-popular models–including some of the colorful, diminutive iPod minis and the 20-gigabyte white iPod–are out of stock through, and other Web sites. Target stores in Chicago and the San Francisco Bay Area say they are out of many iPods, as does J&R Electronics, a big electronics store in New York. Best Buy is out of most iPods on its Web site, although a company spokesman says the vast majority of its stores ‘have at least one’ iPod in stock.”