打折的常见说法：
折扣 discount
打七折 to give a 30% discount
打九折 to offer a 10% discount
打五折 50%off
降价出售 on sale
便宜货 bargain
讨价还价 to bargain with sb.
常见商品的表达：
文具用品 stationery
化妆品 cosmetics
鞋类 shoes
男士服装 Men’s Wear
女士服装 Women’s Wear
牛仔裤 jeans
体育用品部 sportswear department
休闲服装 casuel wear
体育用品 sports goods
电视 TV
电子类产品 eletronic products
播放机 DVD player
数码摄像机 digital video camera
二手车 second-hand car
其它：
购物 shopping
购物 to do some shopping
购物 to do grocery shopping
就是逛逛 to do window shopping
购物单 shopping list
卖光了 to be out of stock
卖光了 to be sold out
有现货 to be in stock
商品标签 price tag
收据 receipt
商品目录 catalog
结账 check
收银台 check out counter
发票 invoice
送货 shipping
送货 deliver
最新款式 latest style