Solve the following math problem: A woman needs to buy 16 oz of butter for a dessert recipe.  She can either buy a single 16 oz package of the store-brand butter for $7, or she can buy an 8oz package of store butter for $4 and use a coupon to get an additional two 4 oz packages that normally sell for $2.0 each at a 50% discount (which is applied to each 4oz package separately).  What is the lowest price she can pay for the 16 oz of butter she needs?