Cost Per Sale (CPS) is the amount of money you’re spending to generate a single sale. Those familiar with Google AdWords are probably familiar with Cost Per Action (CPA), CPS is similar because an action on Amazon typically means a sale. The Cost Per Sale is similar to ACoS because the metric is calculated by adding the sum of all of your sales divided by the sum of all your advertising costs in order to get an average Cost Per Sale. The CPS is displayed in a dollar amount instead of a percentage.