a refund
a discount
a receipt
a price tag
take sth back
a bargain
A piece of paper with a rice that is attached to a product, or the amount that something costs.
Something at a lower price than it's value.
An amount of money that is given back to you, especially because you're not happy with a product or service y¡that you have bought.
A piece of paper that states that someone has receiived money or goods.
To return something you have bought to a shop.
A reduction in the usual price.