Can you share the website URL, page, and password (if applicable)? Thanks!
This Custom CSS will add .ea after the price on every product:
.product-price::after {
content:'ea.';
}
If you want to target just some items you'll need to identify the product ID, use this guide:
https://squarefortytwo.com/squarespace-guides/find-an-id-in-squarespace-71
and then you should be able to have code that looks like this:
#item-6360381ff4b61f0f952c807c, #item-6360381ff4b61f0f952c426b {
.product-price::after {
content:'ea.';
}
}
There are two product IDs separated by a comma, you can add as many as you need.
Hope that helps!