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What are the top 5 commercially available materials (not limited to just the elements) with the highest density to cost ratio?

To point to an application, say that my goal was to mass produce a solid 1 meter cube for consumers and I wanted to make it as heavy as possible, for as cheap as possible. What is the best material choice?

Now, sort your list based on their associated negative environmental impacts (from most to least impacting). Please include your reasoning/sources for the top 1 or 2 materials in your list.

Factors to be considered when gauging environmental impact: How invasive/disruptive/polluting are the material’s acquisition, production, or disposal methods.

I referenced this material density chart which listed elements mostly (not many materials) and found that Iridium is the densest element w/ d=22650kg/m^3 (i.e., the weight of our cube would be 22650kg). The best cost chart that I could find was on wiki, which stated that the current cost of Iridium is 42000/kg which brings the material cost of our cube to $951.3E6!