cvs $4 off $20胖子买buy one get one free# PennySaver - 省钱一族t*y2014-12-13 08:121 楼想买cvs这周买一赠一的电池,问下用off胖需要买够多少钱?free的电池算价钱吗?还是要实际消费$20,谢谢