in Karachi, such numbers are specifically sold.
A random number of ur choice costs 5000 bucks.
A series number, like 222, 555, 777 costs a lot more, around 20ish, i think.
If number AND prefix (ALL, ASK, AMG) of ur choice, then anywhere around 80k ( when i asked about my swift 1328cc).
the amount paid varies with displacement.
A 1000cc car will get 777 for much cheaper than, say, an 1800cc car.