car key?

ok the metal bit of my car key fell out and is lost, i still have my thob to the car and can get in i don't have the key cutting code to get a new key, wat to do. i have been told that if i get the lock off the key cutters can get a key cut from that is that true or wat can i do, the cheapest option. car is a ford focus st170 thank u

luke fitzpatrick
August 2009