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rip off 宰人; 坑人
The price is a rip off, so I never buy anything from that shop.
那的价格很坑，所以我从来不在那家店买东西。

coupon 优惠券 /ˈkuː.pɑːn/
You can collect points from the soda bottles and use them to get discount coupons.
你可以从汽水瓶上收集点数，然后去兑换打折优惠券。

free shipping 包邮
Many stores offer free shipping if you spend a certain amount.
如果你购买了一定量金额的东西，许多店都会包邮。

return policy 退货政策
Not all the shops offer free return shipping, so you have to know a retailer’s return policy before buying their products.
不是所有的店都会给你免退货运费，所以你得在买商品之前了解清楚店家的退货政策。

loyalty program 会员计划
/ˈlɔɪ.əl.t̬i/
If you join our loyalty program, you could earn some money back on your purchases.
如果你加入我们的会员计划，你买东西时就会得到一些返现。

shopping cart 购物车
special deal 特价商品

price difference价差
There&`&s often a price difference between an online store and a physical store.
网店和实体店往往会有价差。