[問題] 7-11的面膜、凍膜全系列商品同價位買1送1算法
剛剛去小7看到面膜、凍膜全系列商品同價位買1送1
當下超心動的.之後我拿了一個heme凍膜和兩盒兩片裝的面膜
結果店員說這樣是198元
接著店員說面膜是四盒兩片裝的面膜算99元
那這樣子面膜上的買一送一是有差別待遇囉??
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