Perhaps you need to bite the bullet on the sand cost... Remember, you don't need all live sand, not even a majority... Just find some that you deem rich in life, and add a few pounds... Or, look up ***delete*** on the net. They specialize in that sort of thing.
As for the introduction of copper into the home aquarium, there can perceivably be a multitude of ways. One being the use of aquarium medications that contain it, as it is a useful med in specific applications. And of the other methods, well, think about it... Sand from where?