BanaCherry, I update this guide now and then, but I don't really have to update the prices since they more or less stay the same. There is also advice on how to calculate yourself what the trip will cost. The first step would be to figure out around which dates you want to go and check the flight ticket prices, once you have that it's easier to find out what the hostel and food will cost you in total.
I wish you all the best in planning your trip and I hope you'll make it
