SSL Certificate issue

After reading another post, with the same issue i found out that the domain needs a SSL Certificate for the check out to work. I dont want to have to purchase the SSL Certifiacte. How do i make the the shopping cart not redirect to https and just stay http?

here the website links to show what i mean
http://cleaningcredit.com/store/products/ - product page works
https://cleaningcredit.com/store/shopping-cart/shipping/ - check out does not.

thank you