In China an many places cash is the best way to pay. And that is also for paying your rent or buying some expensive things like a stero system for 20000.-RMB. It would be easier if there was a note bigger than the 100.-RMB note. But there is not. I still feel strange each time going to a bank and getting a huge stack of money and stuffing it into my bag hoping nobody is watching me. You need to bring a big enouh bag with you.