Yesterday, we glimpsed leaked Canadian prices for Windows Vista. Now, Amazon.com has a U.S. price and release date for the operating system.

Amazon has Microsoft Windows Vista Ultimate DVD-ROM listed for $399. "This item will be released on January 30, 2007," the listing says. It also notes that the product has been available on Amazon since Aug. 15.

Jupiter Research analyst Joe Wilcox appears to be among the first to point out the Amazon listings. He also has a thorough list of Vista prices vs. comparable XP versions/upgrades. The gist: "The Ultimate version looks like a premium price to me, but the other versions are reasonable compared to Windows XP," Wilcox wrote.

More: Microsoft released a statement through its public relations agency, attributed to Kevin Kutz, director of Windows Client.

It is still too premature for us to comment on the final pricing for Windows Vista. We plan to announce Windows Vista U.S. pricing when we ship Windows Vista [Release Candidate 1], later this quarter. We are not providing specific guidance on the availability date for Windows Vista yet. As you know, we are targeting Windows Vista availability for volume license customers in November and general availability in January 2007, although the exact delivery date will be subject to achieving quality metrics based on customer feedback.

Microsoft Office 2007 appears to be scheduled for a simultaneous launch with Vista. Amazon lists the program for $399 and says it will be available for release on Jan. 30, as Microsoft Watch pointed out.