As part of Sony's collaboration with Pottermore and the Pottermore Shop (the exclusive home of the Harry Potter eBooks), Sony will offer a voucher to redeem against the first eBook in the Harry Potter series, Harry Potter and the Sorcerer's Stone, for free.

ENGADGET: Sony Reader gets a new design, Evernote integration and a free Harry Potter book for $129

Pottermore, a unique website which builds an exciting and immersive online experience around the Harry Potter books and is the exclusive retailer of the Harry Potter digital eBooks, is partnered by Sony.

ENGADGET: Sony's new Reader Wi-Fi is the world's lightest 6-inch e-reader with multitouch screen (update: powered by Android)