I would not call this fossil rare while at the same time not say it is common either. What makes this particular find nice is the number ...

I have been printing some more Megalodon  shark tooth fossils based off the scanned model found here:  http://www.thingiverse.com/thing:...

This image is of a  Dalmanites reussi  (Barrande) trilobite pygidium fossil from the Devonian Period. Found in the Tétin Czech Republic. ...