In the US, 27 cents was never a first class rate. It was valid for a postcard in May 2008 to May 2009.
One first class stamp would cost 42 cents. A postcard would have been 27 cents.
The cost was 26 cents at the start of the year. It went up to 27 cents on May 12 of that year. It had been 24 cents until in January 2006.
Cost of a postage stamp was dependent on the face value of the stamp. The most common rate stamp is for First Class Mail. In the United States in August of 2008 that was 42 cents for the first ounce.
On 1975 it cost about 27 cents
27 cents
1918 saw the average raise rise to $875 per year. The average house cost $6,715 and the average car cost $360. Although it is difficult to find the price of a pint of milk, a gallon of milk cost around 55 cents in 1918.
In the 60s.
27 cents a sq foot
27 cents an ounce
42 cents HOWEVER on May 11th, 2009 it will be raised to 44 cents
The post card rate in October 2009 is 28 cents. It was raised from 27 cents in May of 2009. The price has gone up a penny a year for the last 3 years.
The USA rate is currently 44 cents [July 2009] for one letter. (per ounce, that is - about 3 pages with an envelope at the maximum). See the USPS link below: