Wherearounds do you live? When in Europe you could contact the german automobile association, the ADAC in Munich. They also offer carnets also for persons living outside Germany.
A few years ago I needed a carnet, and paid a fee of € 150. That was it. Had to deposit the equivalent of my bikes value, but a minimum of € 3,000. A year later, after I returned to Europe, the 3k € where refunded without any additional fee.
Only when we pause to wonder
do we go beyond the limits of our little lives.