Found a U.S. Based supplier for weights like Phillip. Figured I pass along the details. Thanks for the tip Phillip.
https://bullseyeoffice.com/products/heavy-duty-stainless-steel-doorstopper?variant=29724517204040
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I stopped by a local metal shop and picked around their off-cut section. I got 4 6cmx6cmx5cm hot rolled steel almost-cubes cut for $20CAD. 3lbs each. A half hour with a file to clean up the edges and I'm wrapping them in leftover leather.