Cost of a 2003 postage stamp?

Answer 1

The cost for the first ounce of postage in 2003 was 37 cents. It had been at that rate since June 2, 2002.

Answer 2

The US domestic rate for an ordinary 1st-class letter was 39 cents in 2007, until
May 14, when it went up to 41 cents.

Answer 3

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 2003 that was 37 cents for the first ounce.