For some countries local licence is valid and International Driving licence is valid for 3,6 or 12 months only depending on the country. Check the country before you go. Some countries only need the photocopy of original Sri Lankan licence to to stamped by foreign ministry.But u need to pay 500rs to RMV to get this paper to foreign ministry .
I think AA of Sri Lanka is charging 8800 for International Licence. But u need paper from RMV.