For tonight's dinner we needed some lemon juice and some bok choy. The lemon juice cost 17 kuai, about 2 bucks. The tender, young, fresh bok choy cost 1 kuai, about 13 cents.
We were even prepared to bargain for the bok choy, especially when the vendor put waaay more in the bag then we needed. Apparently she was just trying to sell us enough so she could get away with charging us 1 whole kuai.
We decided not to try to bargain down.