Who's going to do shopping today?
Don't touch them, they're for sale. / Don't touch them, these are things for sale.
I'm sorry, but this item has already been sold.
We've got a good selection of goods at our shop!
Buying is when you give money and get something you asked for instead.
Try this dress on, it looks brilliant!
At our shop you won't see clothes made of cotton, because we care about your health, and we don't want you to suffer from allergic reactions.