NEW YORK (

TheStreet

) --

Amazon

(AMZN) - Get Report

said its Kindle sales tripled since it cut its price on the device, and e-books have outpaced that of physical books.

Last month, Amazon took $70 off the ticket price of the original Kindle, bringing it to $189. It also slashed the price on its new Kindle DX to $379 from $489. The company, however, still did not provide a number for how many devices have been sold.

This move came after

Barnes & Noble

(BKS) - Get Report

lowered the price on its Nook e-reader.

"In addition, even while our hardcover sales continue to grow, the Kindle format has now overtaken the hardcover format," CEO Jeff Bezos said in a statement. "Amazon.com customers now purchase more Kindle books than hardcover books -- astonishing when you consider that we've been selling hardcover books for 15 years, and Kindle books for 33 months."

Amazon is set to report its second-quarter earnings on Thursday.

-- Reported by Jeanine Poggi in New York.

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