With this module your customer can setup an special offer allert. (customer is informed via email with x days before special offer expire)

Example: Customer is on Product A page. He saw the special price is 200$ (old price: 400) and decide buy this product later.

Customer press "Special price reminder button", and specify to be informed with X days before offer expire.

When only X days left he receive an email with this offer.

Demo: http://demo.oc-extensions.com/modules/index.php?route=product/product&product_id=29 click on Special offer reminder button (right side)