An ad from 1957 said that Silly Putty was $1.00, the same price as today. What else hasn't changed price in that amount of time?
https://www.youtube.com/watch?v=lgrhTfhg8mM
http://www.toysrus.com/product/index.jsp?productId=23769616
(This inflation calculator puts the buying power of $1.00 in 1957 as $8.41 today: http://data.bls.gov/cgi-bin/cpicalc.pl?cost1=1&year1=1957&year2=2014)
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