My most of the purchases are through ck-modelcars, i have some kind of links in my customs so i do not have to pay high charges, usually i pay around 1000rs per model if the order is like 3-4 models.
But legally the actual customs and taxes according to the HS Code of diecast car models, its around 40-43% of the total value.
On the other hand, i heard the customs are not levied on the toys worth below $200 / 20,000pkr but our customs wont let us take anything custom-free, you must pay $$$ them to get things done, sadly.
When you'll be buying from ck-modelcars, ask them to declare the 50% invoice value (thats the least they can declare).