A week ago, it seemed as if Taylor Swift's third studio album, "Speak Now," released Oct. 25, was on its way to selling at least 800,000 to 900,000 copies sold in its first week. But 1 million copies? Possible, but not a done deal.

Now, label sources say that that magic million first week for "Speak Now" is almost a certainty. And the set's a clear lock for a No. 1 debut on the Billboard 200 chart.

While Nielsen SoundScan's official first-week tally won't arrive until Wednesday (Nov. 3) morning, all signs point to a historic debut. (SoundScan's tracking week runs through the close of business on Sunday, and their numbers, which are reflected in Billboard's sales charts, are reported each Wednesday.)

If "Speak Now" starts with 1 million, it would instantly be the best sales week for a single album since Lil Wayne's "Tha Carter III" bowed with 1,006,000 June of 2008. And we're hearing that the album's launch might even be bigger than "Carter III." That could mean "Speak Now" would have the biggest week for an album in over five years, scrolling all the way back to March of 2005 when 50 Cent's "The Massacre" slayed the No. 1 spot with 1,141,000 sold, according to SoundScan.