This module includes an extra MSRP (Manufacturer's Suggested Retail Price) field in your admin on the product page.
If a MSRP is entered, it will display on your storefront with the following layout:
MSRP: $100.00 (with strikethrough)
Our Price: $75.00
You Save: 25% ($25.00)
Versions 1.3.8 and 1.3.9