I was looking this up today on another site.
There were some 1900's razors that were around three dollars, so I looked up how much that would be back in those days. The site I used said to use "Unskilled Wage" or "GDP per capita" for the value of commodities. A three dollar razor comes out between 350-500 USD now.
http://www.measuringworth.com/uscompare/