How to set product price manually on COLLECTION page?

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The path: landing page>collection>product. 

Showing a group of different photos with their respective price there at the COLLECTION page.

But I want to change some of the price showing on this page manually, as there are some carrying small parts and accessories in the same product page, e.g. A Frame ($20) + a nail ($2) in the same page. And I don't want to split it into 2 product pages. 

Currently, inside the product page there's no problem. But the system displays the Frame photo with a nail price ($2)+ on the collection page. 

How can I set it mannualy?