rip off 宰人; 坑人
The price is a rip off, so I never buy anything from that shop.
You can collect points from the soda bottles and use them to get discount coupons.
free shipping 包邮
Many stores offer free shipping if you spend a certain amount.
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.
loyalty program 会员计划
If you join our loyalty program, you could earn some money back on your purchases.
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.