That makes two of us who are Mandarin challenged. I initially was surprised that I didn't see DCC at Chung Yo even though it definitely exists. The same was true for Shin Kong Mitsukoshi. There is an easy way to preemptively disable DCC. The terminal was definitely presenting options, but I never would have known for certain had I not been observing the terminal.

It's hard to say with absolute certainty how many DCC situations we've avoided, but I've limited my use of a credit card outside of department stores and hotels, two prime locations where DCC tends to rear its head. I don't think Watsons does DCC nor does a local housewares store. We also got beyond confused looks requesting to be charged Taiwan dollars at Taiwan Mobile. There have been similar reactions at local clothing stores that don't cater to foreigners.