Looking for textbook

So, I´ve just decided to start russian for real and from what I have researched the textbooks that would suit me the best as an absolute beginner are the Sputnik: An Introductory Russian Language Course.

My problem is: They either don´t sell at my country (the workbooks) or go for an absurd price at amazon (300+ bucks when minimum wage is 1300), Does anybody know where I can find them in pdf format?