Lone Survivor, once again, took the #1 spot on Apple's iBooks bestseller list, still enjoying a sales boost thanks to the film adaptation of Marcus Luttrell and Patrick Robinson's 2007 book (the movie landed #2 at the weekend box office). Former defense secretary Robert M. Gates' memoir Duty saw the greatest drop in the top 10 for the week ended January 27, sliding from #2 to #8.

Sue Monk Kidd's The Invention of Wings, an Oprah Book Club 2.0 pick, climbed from #15 to #9. Joyce Maynard's 2009 Labor Day was new to the list last week -- the film adaptation of Maynard's novel, starring Kate Winslet and Josh Brolin, hits theaters January 31.

iBooks US Charts - Top Paid Books

1. Lone Survivor by Marcus Luttrell & Patrick Robinson (Little, Brown and Company)

2. Divergent by Veronica Roth|Katherine Tegen Books)

3. Insurgent by Veronica Roth (Katherine Tegen Books)

4. Allegiant by Veronica Roth (Katherine Tegen Books)

5. The Goldfinch by Donna Tartt (Little, Brown and Company)

6. Sycamore Row by John Grisham (Knopf Doubleday Publishing Group)

7. The Fault in Our Stars by John Green (Penguin Group US)

8. Duty by Robert M. Gates (Knopf Doubleday Publishing Group)

9. The Invention of Wings by Sue Monk Kidd (Penguin Group US)

10. Labor Day by Joyce Maynard (HarperCollins e-books)

11. Flowers In The Attic by V.C. Andrews (Pocket Books)

12. Gone Girl by Gillian Flynn (Crown Publishing Group)

13. Fifty Shades of Grey by E L James (Knopf Doubleday Publishing Group)

14. Twelve Years a Slave by Solomon Northup (Atria / 37 Ink)

15. The Husband's Secret by Liane Moriarty (Penguin Group US)

16. Flirting With Desire - Complete Collection by Lucia Jordan (Vasko)

17. Command Authority by Tom Clancy & Mark Greaney (Penguin Group US)

18. Super Shred: The Big Results Diet by Ian K. Smith, M.D. (St. Martin's Press)

19. First Love by James Patterson & Emily Raymond (Little, Brown and Company)

20. Final Vow by Kathleen Brooks (Laurens Publishing)