Here are the official numbers from Publisher’s Weekly (h/t cuatrocinco45):

Nonfiction

1. Decision Points. George W. Bush. Crown (11/10) 2,653,565
2. Broke: The Plan to Restore Our Trust, Truth, and Treasure. Glenn Beck. Threshold Editions (10/10) *860,0002
3. Women Food and God: An Unexpected Path to Almost Everything. Geneen Roth. Scribner (3/10) *850,000
4. Life. Keith Richards with James Fox. Little, Brown (10/10) 811,596
5. America by Heart: Reflections on Family, Faith, and Flag. Sarah Palin. HarperCollins (11/10) 797,955
6. The Daily Show with
Jon Stewart Presents Earth (The Book): A Visitor’s Guide to the Human Race. Jon Stewart. Grand Central (9/10) 782,871
7. Sh*t My Dad Says. Justin Halpern. HarperCollins/It Books (5/10) 761,000
8. Barefoot Contessa How Easy Is That? Ina Garten. Clarkson Potter (10/10) 722,608
9. Pinheads and Patriots: Where You Stand in the Age of Obama. Bill O’Reilly. Morrow (9/10) 662,950
10. Chelsea Chelsea Bang Bang. Chelsea Handler. Grand Central (3/10) 653,321
11. Straight Talk, No Chaser:
How to Find, Keep and Understand a Man.
Steve Harvey. Amistad (12/10) 626,732
12. Spoken from the Heart. Laura Bush. Scribner (5/10) *605,000
13. The Big Short: Inside the Doomsday Machine. Michael Lewis. Norton (3/10) *600,000
14. The Power. Rhonda Byrne. Atria (7/10) *525,000
15. Unbroken: A World War II Story of Survival, Resilience, and Redemption. Laura Hillenbrand. Random House (11/10) 518,000

Keep in mind too that her book was released in late November. By contrast, only 224,684 bought Mitt Romney’s vapid and incoherent book, even though it was released in March.