With 25$ you can compute with a Raspberry.

Known as computer on a stick ,RaspberryPi,becomes more popular than Lady Gaga!.

Raspberry Pi is a credit-card sized computer that plugs into your TV and a keyboard. It’s a capable little PC which can be used for many of the things that your desktop PC does, like spreadsheets, word-processing and games. It also plays high-definition video. The Model A will cost $25(  1225) and the Model B $35(  1715), plus local taxes.Still Aakash(2500) remains the cheapest tablet/computer because unlike aakash raspberry does not come with a monitor and ethernet(mod A) and wireless networking ports.