The magazine, targeting people between ages 18 and 34, is available for a 14-day free trial, and then will charge a $1.49 monthly subscription at Amazon.com.

Amazon has not revealed its official sales since Kindle's launch in November 2007. However, the company has had trouble keeping the device in stock, and it apologised last month to customers who have had to wait up to six weeks to get one, according to Folio.