22 February, 2013
The Canmaker is a trade magazine which prints articles and advertisements about making cans. Twelve issues of it cost $3,147.35.
Which would pay for a 213-year subscription to National Geographic.
EDIT: The publisher is not happy about Canmaker appearing on this blog, and has written to inform me that individuals can purchase Canmaker for only $295.72 yearly. (Also, the direct-from-the-publishers institutional price is $2,873.86, not $3,147.35.)