I really wanna go to China BUT

I dont want to be cheap, but its going to cost 56,600 yen to get to Shanghai and back. That's 500 bucks for 8 days. If I waited until I was ready to quit teaching here, I could take my time and spend only 18,000 yen on the Osaka-Shanghai ferry (it takes 2 days to cross the Sea of Japan) and with that extra money spend who knows how many additional days in China. I feel like I've already committed to traveling with this week off, but it suddenly makes more sense to me to see China at the end of the trip and pocket the difference.

Maybe I'll just do both.