I will be more than happy to combine shipping to keep cost down, when possible. To keep prices low, I use media mail for books. This means

I am unable to combine shipping for books with anything in another category unless I go to the higher priority rate.
 I ship three days a week so if you need it quicker please let me know.

 While I have a non-smoking and pet-free home, I do try to be green and buy used when possible. This said, I cannot guarantee the life led by my books prior to purchase :). 

THANK YOU!