The point of a boilerplate is to test out the features of a system at a reduced cost. I would like to know what it cost to build the Apollo boilerplates. There was a series of such rockets so I would appreciate any cost data available on any of them.
Regarding NASA boiler plates for the Apollo program, one source claims,
The 1200 series were manufactured by a firm called Ace Fabrications in Clute, Texas, each costing some $10 – 15K.