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Custom Opportunity Field times Sales Price

i want to creat a field called PC Amt (PC_Amt__c) = PC_QTY__c * Sales Price (sales price from the products)
Problem is when i try to create a new formula field in opportunity and i select PC QTY as the field and then the "*" i have no way of selecting Sales Price from the fields drop down menu.
Does anyone know how i can do this?