Add an external buy button on shopify

I have my products available on both Amazon and a dedicated Shopify store. For customers looking to take advantage of Prime shipping over what our store can offer I'm looking for a way to add a "buy from Amazon" button next to "Add to Cart" which is an another amazon link which i ll give you

Hopefully there's an add-on that can do this as I'm not sure how I would go about trying to manually edit the code for each product page.
if u can do it pls respond
thank you