Not able to find foolscape paper of approximte size of 13*8 inch for CS intermediate responce sheet.?

Hi All,
I am persuing CS and i have to submit responce sheet by 28th Feb,but they have a condition that the answer should be written on foolscape paper of approximte size of 13*8 inch.but i am not able to find this size of paper on any bookstore.

if anyone knows that from where we can find this paper then please reply me.

my e-mail id is [email protected]

It would be a great help for me.

Thanks in advance