Look Ankit, budget of any trip depends on the traveller. How the person want to travel? If you have any place in mind to visit in North East India then do some research about that place . Like what are the things you want to do over there and for how long you want to travel. Choose for public transport whenever and wherever possible. You can do couch surfing or go for Hostels to stay. Eat at local spots .This will help you save more in your pocket , also you will have the best food of that place. You can do hitchhiking too .
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Check Sikkim or Meghalaya tour packages on tripoto for North East
You can make budget trip thats depends upon your travel and fooding style it can reduce and increase trip coast, for example if you call taxi for ride rather than public transport it increases the travel expense