44 cents...if you purchase 'Forever' stamps at current rate, they remain valid as rates increase. For people who send a lot of mail, this is a great investment!
44 cents as of August 1, 2010. The price will probably go up in early 2011, but you can by a "forever" stamp now for 44 cents that will be good for first-class postage"forever".
First Class postage was 3 cents in 1935. There were still other stamps available for post cards and airmail. The price was dependent upon what you were mailing.