Hello everyone

Well I have gone through many threads for recommended books and finally decided to buy these two for paper 1

-Modern Economic Theory (KK Dewett)
-Economics international edition (Paul A. Samuelson)

Well I have asked a friend from Lahore to buy me these but he was unable to find these books. So can anyone tell me form where i can buy these new or old I don't mind. please mention specific shops of Islamabad or Lahore.

I will be obliged