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Smith's has Jennie-O Frozen Turkey Burgers on a Buy 1 Get 1 FREE sale through 2/27. With just the sale price each box drops as low as $4.50 each. There's a $0.75/1 printable coupon that brings each box down to $3.75!
If your store doesn't allow you to use a coupon on a product made free by a sale, then you will need to adjust your scenario accordingly.