Have you ever changed non-detachable poewer cord?

I own VTL MB100 tube amps and they don't have detachable power cords. My current ones are not stiff anymore and too soft showing sins of wear. I also believe that they create a great deal of hum and don't bring a sufficient and clean power onto my amps.
Is there any way for me to get non-detachable power cords 12AWG minimum and with budget of $100 for both?