By Esteban Israel and Marcela Ayres SAO PAULO (Reuters) – Amazon Inc. started selling its Kindle online in Brazil on Friday, expanding from ebooks into retail for the first time in Latin Americas biggest and most challenging ecommerce market. By shipping its ereader devices across this immense country, Amazon will now get a taste of Brazils notorious logistics problems, widely seen as a deterrent for a full-fledged retail operation like the one it has in the U.S. The worlds largest online retailer launched an Internet bookstore in Brazil in 2012, a low-risk landing on this $11 billion emerging ecommerce market. Up to now, the Kindle was being sold at bookshops, appliance stores and even kiosks in shopping malls.