The Aakash Tablet which cost only 2500 INR which is less than 50USD, started to sell online, but which is sold out now.
Now you can Pre-book higher version of Aakash “UBISlate 7” for 3000 INR which is less than 60$
I prefer you spend 500 more and book UBI Slate 7 which having more cool features and powerful processors (almost double speed) than Aakash. UBI Slate 7 will be available Late January says the website.
Pre-Book your tablet here - http://www.akashtablet.com/