一对先锋（Pioneer）书架式音箱通常卖127美元，但在八月份其价格会趋向显著下降——2014年八月降至60美元，2015年八月降至88美元，限时到开学季。
A pair of bookshelf speakers made by Pioneer are typically $ 127 , but that tends to drop significantly in August - to $ 60 in August 2014 and to $ 88 in August 2015 , timed to the back-to-school season .
书架音箱