Sweeten the Pot
When someone gives something away for nothing, there isn’t much you can do to negotiate a better bargain because they gave it away for free. This specific thing is already provided without cost, especially if you’re looking for anything comparable.
When someone approaches you, asking if you could add to the free combination to make it worth his while, the most excellent approach may be to remind him that the thing is entirely free. We also have to commend this individual for handling the problem uniquely and creatively.