Simple arithmetic, how to travel to China: if this tour to Hainan Island, then lay on 1-2 thousands of dollars per person. And if you want to go on their own, then set aside (prices for one) least 500-600 dollars on flights and from 1500 rubles on vyzu; transfer to long-distance bus (2 hours trails) 10-15 $; trains from 4$, across the countries in platskarte by 80 Yu.E., but there are hitchhiking. Overnight at hotel (price of double) of 20$, but there kauchsёrfing; food – from snacks for half a dollar-dollar, to lunch at the restaurant of the 4-15 dollars for the approach. There is everything and cheaper, and much more. Now take the length of your move, multiply and add up all. Godspeed!