Here's this week's Futurebook chart with Luzme prices.

If it doesn't show up, then you can see the original live at http://luzme.com/chart/futurebook.

Comment from Philip Stone, Charts Editor at the Bookseller: "For the third week in a row, crime-writer Karin Slaughter's The Unremarkable Heart, Random House Group's first ever direct-to-digital fiction title, takes top spot in The Bookseller's eBestseller list. Last week's number two, Stephen Leather's The Basement, falls five places to seventh overall, while George R R Martin's A Game of Thrones, the first installment in his epic medieval fantasy series, A Song of Fire and Ice, climbs three places into second position - off the back of solid downloads at Amazon.co.uk, Waterstones.com and Apple's iBookstore. All three retailers (as well as WHSmith) are selling the ebook at £5.49 — two pence dearer than the print edition's average selling price at UK bookstores last week. The second book in the series, A Clash of Kings, re-joins the chart in 10th position, while Rosamund Lupton's Afterwards and Caitlin Moran's How to be a Woman are the two new entries. Lupton's first novel, Sister, was one of the bestselling bestselling novels of 2010 thanks to a spot in WHSmith's Richard and Judy book club, while sales of Times columnist Moran's memoir/rant has benefitted from an extract in her employers own magazine."

And comment from me:

• Why, I wonder, is Waterstones the only bookstore not to stock Karin Slaughter's "The Unremarkable Heart"? It's been top of the list for 3 weeks now.

• I notice that Amazon has it 10% cheaper than the rest: a whole 4p!

• Given that the number #3 "Catch Your Death" is only available at Amazon, that shows how strong Amazon's grasp on the market is.

• Apple stand out as most expensive by over a pound on 2 of the titles, Rosamund Lupton's "Afterwards" and Michael McIntyre's "Life and Laughing". I wonder if they realise?