Show/hide pricing on different stores within one site

Site URL: http://www.sarahfinucane.art

How can I add code that is store specific on sqsp 7.1?

Use Case:

• User has 3 stores in her site
  • store 1: original paintings
  • store 2: prints
  • store 3: digital downloads
• User DOES NOT want to show pricing on original painting store
• User DOES want to show pricing on digital downloads and prints stores

When I add this code to the CSS it hides price on the entire site. 
<style>
.product-price { display:none }
</style>

How can I add code that is store specific?

Hover Original Paintings Page on Not Linked or Main Navigation > Click Gear icon > Click Advanced > Paste your code