In one of the upcoming lectures I mention the free ISLR book download link, its been updated, you can now just find the link on the homepage for the latest edition (on the right you see a picture).

Here is that link:

www-bcf.usc.edu/~gareth/ISL/

Here is a link to the book directly:

http://www-bcf.usc.edu/~gareth/ISL/ISLR%20Sixth%20Printing.pdf