A mark 84 bomb, one of the largest conventional munitions in frequent use, costs about 3k a piece. The mark 84's smaller cousins are cheaper. JDAM kits costs about 27k a piece. How am I making things up?

No one's making shit up in this thread.

A 500-pound dumb bomb consists of about 250 pounds of steel and 250 pounds of high explosive. Plus a fuze.

When manufactured in large quantities, $3000 in 2014 dollars seems like a reasonable cost.

(Most of the ones in the US Air Force's inventory were manufactured decades ago.)