That comes from experience brother.
When in Lahore, I know which people import engines from Japan and who does it from Thailand etc.
Prices are different. Japan import is expensive.
I needed a head assembly for cultus 2005 around 2.5 years ago. The rates for it in Bilal Gunj at that time were ranging between 30-45k in the whole market. I bought one for 52k after lots of efforts.
If you are in Lahore, I may get it for you.