Calendar display page with "add to cart" buttons. -- 2

I have an existing image gallery built in CodeIgniter. There is a functional cart for buying images. But I would like to have the ability to create pages (from the existing admin ) showing products like eBooks,calendar ( so showing images of these ) and have "add to cart buttons" for them. So clients can purchase the products displayed on the pages. These product pages will need to work in conjunction with the existing cart system. This project is set for $100. Please don't bid if this is not agreeable to you. I need you to have TeamViewer to see if you can do this project first. I was told this is not an easy project. So I need confirmation first by you, the bidder, looking at the code first to see if you can work with the existing code to build this new function. Payment will only be released after the work is done. I will not pay outside Freelancer. Please bid after reading these requirements. I will give you details of the project after your bid.