Background
An ancestor of mine from Iowa should have registered for the WWII draft in the Fourth Registration, which is also known as the Old Man’s Registration. FamilySearch has a collection for these records, but records from Iowa have not been indexed (and Iowa is not available for browsing either).
The physical copy of these draft registration cards are at the National Archives in St. Louis, MO, US.
Question
What is a cost effective way to obtain a (scanned) copy of a document from this collection?
I would prefer if I did not have to go to the National Archives myself to obtain the copy. Is there a company (or individual) that I could pay to obtain this copy on my behalf?