Krtek (mole) - How best to get rid of them?

It's ruining my lawn/garden. The cartoon character might seem cute, but the real thing is a royal pest! We tried the pictured ultrasound deterrent and it doesn't work. Next year I may want to sell my property and don't want the garden destroyed. Suggestions for methods or products? Though a humane method would be ideal, desperation might warrant less generous methods. Photo of our lawn attached.