98 cents
As of May 2011 any postcard over 4.25"x6" and less than 6.13 x 11.5" is considered regular First Class and is $0.44
tree-fiddy
Here is a site that has the information you are looking for http://www.prometric.com/NR/rdonlyres/ebi7ryy5oknk74imu7ruk4wofnfjen674endyxp554t446wg64ryi4poz4353lkseom4jikujqlr2zdg4xrrksinzjc/ARCNABulletin20060208.pdf
postcard_must_be">The price of a single First-Class postcard stamp is $0.29 To qualify for mailing at First-Class Mail® prices, a postcard must beRectangular and have angular (90 degree) cornersAt least 3- inches high x 5 inches long x .007 inch thickNo more than 4-1/4 inches high x 6 inches long x .016 inches thick
A regular envelope cost $1.89 to send to Mexico.
August 2010 prices. Small Letters and postcards. First class .......- £0.41p - Royal Mail aims to deliver by the next day. Second class.. - £0.32p - Royal Mail aims to deliver within three days.
The current rate to send a postcard is 33 cents. The postcard must be no longer than 6 inches long by 4.25 inches high and .016 inch thick. If it is bigger or thicker, it requires additional postage.
That will depend on where in the world you are sending it from, which you have not specified. Your local post office will give you the most up to date rates, as they change sometimes.
As of January 22, 2012 the rate is 45 cents. You could also buy the "forever" stamp which will never lose its value as a current stamp.
How much is first class postage from US to Poland?
The layout of a postcard must follow specific USPS guidelines. These guidelines include size, zones that designate where the sender's address goes, and proper layout.