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Redmayne said Pottermore sold over £1 million worth of e-books, about $1.59 million at £0.63 pounds to the dollar.
In dollars, the Harry Potter e-books are priced at $7.99 each (for the first three) or $9.99 each (for the final four books in the series). Assuming an average price of $9.13, that means around 164,000 copies were sold in the first three days.

via paidcontent.org

…полтора миллиона долларов за 3 дня. Около 164 тыс экземпляров. Недурно.