Rs. 699 if you have bought Windows 7 PC after 2 June 2012.
For a limited time, upgrade to Windows 8 Pro for a special price. Offer valid from October 26, 2012 until January 31, 2013 and is limited to five upgrade licenses per customer. To install Windows 8 Pro, customers must be running Windows XP SP3, Windows Vista, or Windows 7.
Buy Windows 8 Pro Upgrade: Rs. 1999 | Windows 7 PC after 2 June 2012 Rs. 699