The EPS unit should no more cost than PKR:6000.
The trunk along with viper,rear defogger and spoiler will cost PKR 10 to 14.
The total cost will be approximately PKR:20000.
I have searched the Bilal Gunj and these were the prices there.
You are in Islamabad,you can search Sultan Ka khoo.
If you can bargain good enough maybe you can get it in a cheaper price.