When editing a product, you can toggle its Visibility. This allows you to make specific products for an agency that only they can see/hide certain products to prevent it from being purchased etc.
You will need to create an Agent Group if you want an agency to be able to only view a product/not be able to view a product.
How To Toggle Visibility:
When editing a product, click on the visibility tab here:
It will then display each Agent/Wholesale group that is set up within the company.
By toggling them on and off, it will prevent or allow the agencies to view the product you are editing.