Morocconites malladoides is a common moroccan trilobite.
They are not rare and are not difficult to find, the only problem is the preparation process. Matrix is Sticky and difficult to remove, and that's the only reason because you can see many destroyed and hits trilobites on market and website. It takes time to prep carefully, and this is the only reason for different price range. 
 
Morocconites malladoides
Middle Devonian 
Mader basin
Jabel Ofaten
Morocco