Since Supliful products are available in the US only, you need to make sure that customers from other countries are not able to place orders.
Go to WordPress Admin > Plugins > Add New and find the Country Restrictions plugin;
Install Now and Activate.
After activating Country Restrictions for WooCommerce, you can see “Country Restrictions” in the WordPress admin menu. Click to view settings and get started.
Hiding products based on countries:
While creating a rule for product restrictions for the US you should:
Add rule title for future reference
Select to restrict products
Select individual products
You can also configure restriction message type
Redirect to an internal page
Redirect to a custom URL
Show a custom message
(In the case of “show,” only the specified products will remain visible to selected countries and the rest will remain hidden Whereas in “Hide” the specified will hide for selected countries and the rest will remain visible.)