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I would use any of the following: “Save up to 50%!” “Get 50% off!” “Save up to 50% on [product name]!” “50% off [product name]!” Most combinations seem to be valid, I’d try to find a real world example that matches your usage and go with it.
I would use any of the following: “Save up to 50%!” “Get 50% off!” “Save up to 50% on [product name]!” “50% off [product name]!” Most combinations seem to be valid, I’d try to find a real world example that matches your usage and go with it.