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 Amazon.com, Buy.com 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.”