Can't help with the key or cost but just to help your wife feel a little better .....
When living temporarily in Versailles I drove my BMW 530 down to the South of France for a vacation.
Partway back on the return trip, we stopped at a rest stop. My (ex) wife tossed the keys onto the dashboard, from where they promptyly disappeared into the guts of the heating system.
Totally unable to retrieve the only set of keys with us, I was forced to hitch back to Versailles, retreive the spares and pay for a taxi back about 100 miles to the immobilized BMW.
When living temporarily in Versailles I drove my BMW 530 down to the South of France for a vacation.
Partway back on the return trip, we stopped at a rest stop. My (ex) wife tossed the keys onto the dashboard, from where they promptyly disappeared into the guts of the heating system.
Totally unable to retrieve the only set of keys with us, I was forced to hitch back to Versailles, retreive the spares and pay for a taxi back about 100 miles to the immobilized BMW.