New Command Module

[Sym7]

Hi,
Anyone know where I can get hold of a 2nd hand command module for a mercedes r-class?
My little boy has poked coins into the sat nav slot and caused just the Sat nav has stopped working. Mercedes were going to do the repair under warranty but then said as there were foreign objects in the unit I would need to pay the £3000 to get it replaced.

Any ideas? I don't have £3k kicking around spare!!

Thanks.