Hi Baconj,
A belated welcome to our stamp community!
Sorry to confirm that your German stamps are QUITE common....however there IS a cancel on a stamp in the bottom row which intrigued me. This is what the whole cancel looks like:

The cancel reads "Germany's Oldest Tradefair", a reference to the city of Frankfurt's 800+ year-old tradition. More correctly, the cancel is known as an auxiliary marking or stamp, as it is not part of a hand- or machine-cancel such as this:

Unfortunately, the stamp would have far more value if it had been left on the postcard or envelope intact.
If that exact stamp had remained on the postcard or cover, and depending on the other stamps it likely accompanied, where it was sent, if it was on a picture postcard from the Frankfurter Tradefair, whether it was registered or insured, etc. the card or cover might be worth
much more. Some such cards and covers bring surprising amounts at online auctions or elsewhere, if more than one bidder is interested and motivated enough!
That is why, especially for older stamps, they should
ALWAYS be left on the original envelope if at all possible!
--Jim Wentzell
stampguyaps177-681