You will need to consult the catalogs. First of all, you have to identify the specific stamp or card. That in itself can be a daunting task, but most of the catalogs are well illustrated with lots of information. Once you know what item you have, the catalog will provide a set of prices that can be used to estimate value.
one cent each
Most of them are not rare , but in used condition are worth more than the smaller stamps -- around 1/2 cent to 1 cent wholesale.
Scott Specialized Catalog of US Stamps 2011 has a section for vending machine stamps. Titled 'Vending & Affixing Machine Perforations on pages 521 to 526. There are over 100 - 1 cent & 3 cent stamps in this section. Values range from about $1 to $1000's of dollars. Identification of these vending machine stamps are very specific for each stamp because of issue and perforations.
It is worth 1 cent.
20,000 1 cent stamps with $200.
You can purchase 1 cent or 2 cent stamps.
you have to pay for them...1 cent each
one cent
In the US you can buy two 10- cent stamps, four 5-cent stamps. five 4-cent stamps, ten 2-cent stamps or twenty 1-cent stamps for 20 cents at most post office windows.
One cent
The one cent Euro coin is worth 0.6452 of an American cent.
In U.S. it is worth a out ofa00 for a total of$1