Remove Comment boxes on sales pages

Hi all!

Currently, in my Marketpress/Gridpress theme, my store pages have a blog comment area at the bottoms of all the pages. Client would rather these not be there, but on a separate page.

I think a conditional statement is needed?? But I’m a PHP beginner and don’t know how to write it or where to put it. Can anybody help?

I looked in the general settings for Themes, Writing, and Discussion, but can’t see a place to set each page’s blog entry state.