$1.20 is the rate in December, 2015.
28 cents is the current post card rate.
The postage rate for a standard postcard in the US is 32 cents.
The postage rate in 2012 for a postcard is 32 cents.
33 cents for 2013
It would have cost 3 cents to mail a letter in 1957. A post card was 2 cents.
Contact your local post office. They will give you the current rates.
One cent
about 63 cents
In the United States it would be at the USPS web site. They will deliver them to you through the mail.
A post card is a small note and postage costs less.
55cents
US Mail first class postage was .02 per ounce