Amazon launched a cheaper, wireless-only Kindle on Wednesday, in the hope that its $139 price tag will turn the device into a mass-appeal electronic reader.
The newest Kindle is Amazon's third-generation electronic reader. It is approximately 21% smaller and 15% lighter than previous versions. The contrast, speed of page turns, and bookstore have also been improved.
Amazon does not release sales figures for the Kindle, but announced that the device's growth rate tripled after it cut its price from $259 and said e-books were outselling hardcover books.
Apple has sold over 3 million iPads, priced at $499, since the product's launch in April.