GOT! I want...

I want to read GAME OF THRONES series...

I got it saved in my kindle but i cannot find the will to continue reading... i read up to page 22 of book one...the question is... do i have to buy the book series for me to finish them all? its up on sale at powerbooks! GOT on HBO will resume April 2013... ill have to finish the book (even up to book 3) before it airs again on tv... gosh...