Modify existing script to pull correct discount prices

Hello! I am working on a project that uses this open source script: [login to view URL] and it is only pulling the regular price of the items. Some simple investigation shows that where it is pulling data from has the regular price, and in some cases has a discount price inside the same div. I need someone to modify this script so it still pulls the regular price of the item, but also add a database field for and pull the sale price of the item (or 0 if it isn't on sale).