I think the pattern is known mathematically by the term Voronoi. Google Lens led me to a similar image but I haven't been able to link to it. The name may be helpful in your search. I couldn't find a supplier but didn't try real hard.
Like you, I'd rather buy the lattice instead of making it. Without a CNC it wouldn't be worth the labor, noise and dust.
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- OT: ID This Lattice Material? *PIC*