US Taxpayers Profit from Ukraine War, page-12

The $402 million contract could buy as many as 800,000 155mm shells at $500 apiece, though George cautioned that shipping, packaging, and other services would likely drive the per-unit cost higher.

https://www.defenseone.com/threats/2023/07/us-paying-contractor-quietly-supply-bulgarian-155mm-shells-ukraine/388480/

you'll notice it's the US paying another country in eastern Europe to supply these shells -- (so a cost to US , not a profit ) ----and way cheaper than youm suggest