You can buy tickets from Expedia.com

http://lmgtfy.com/?q=how+to+ge... :) just go through travel websites and call the Nepalese travel agencies to cross check the price.

Ta oli ko arko budi ko Kancho suputra hosh re ni .... halla teastai cha..

Travel agencies buy from airways website and sell it to us adding their profit, I recently bought from Qatar Airways, it is very easy buy online, you can call them if any confusions, or check price buying from Nepal,due to tax, it might cost you cheaper