Don't think you are going to find anything like that at a moderate cost. Very few metals have that kind of density, and most of them are precious metals, or radioactive metals.
Lead is only 11.3 gm/cm^3.
18 karat gold would be somewhere around 15 gm/cm^3.
Tungsten is 19.3. Some alloy with a high percentage of tungsten would work, but I don't think there is anything commercially available in this range.
There are some tungsten carbides that are used in making machine tools that are about that density, but I think they are only used for coatings. I don't imagine they are moderately priced either. You might find out something about them by lookng up machind tool vendors.
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