I need a round ticket to go at the end of this month and all the websites including Matrix, Kayak, etc are giving me $2000 aggregrate. I dont have $2000 and I have no other option but those dates. Is this the ordinary rate for Nepal? Help me. What are some ways I could get better deals? 

 try going through india. Makemytrip.com is pretty cheap. Also, try skyscanner.net. 

 try qatarairways.com too..i found pretty cheap deals on that website, but i cannot be sure if you'll get very cheap quotes as your travel date falls during the peak season for international travel. you can also try calling the nepalese travel agency listed in this site and see if they can hook you up..but qatarairways is the cheapest airlines as per my research out there. 

cheapoair.com

try aire zone travel (airzonetravel dot com), heard that they really give you competitive price.

If you hesitate to travel via India, there is 300 and over difference, try all the travel agents that pops up in Sajha and try others too.