I have created the rule, but when multiple products together, special price products also discounted!
Apply the rule only if the following conditions are met (leave blank for all products)
If ALL of these conditions are TRUE :
If an item is FOUND in the cart with ANY of these conditions true:
Special Price less than 0.01
Special Price To Date equals or less than 2015-04-29
Apply :Percent of product price discount
Discount Amount :8
Apply the rule only to cart items matching the following conditions (leave blank for all items)
If ANY of these conditions are TRUE :
Special Price less than 0.01
Special Price To Date equals or less than 2015-04-29