When working on a new Drupal 7 site I noticed a feature from the old D6 CCK days that allows you to remove a single item from a field that has unlimited values.
This module is an extension of Drupal Commerce that provides a display formatter for the Commerce Price field which shows the amount of savings when a discount is applied.
Features
Formatted price display that is similar to what is seen on many popular e-commerce sites (see attached screenshot).
List price and Savings takes into account any tax amount applied to the current price (ie. VAT tax)
Show/Hide price labels
Select which values to show - List Price, Your Price, Savings