Use the following trick for duplication or a permanent enchantment. You can 
duplicate a drop-able
item, and if that item is equipable with constant effect enchantments you 
can make them permanent.
However, the item once made permanent cannot be re-equipped, but each 
enchanted item is different.
You can use the "Duplicate items" trick to make as many as desired, then 
sell them. Use the "Duplicate
items" trick with a bow an arrows to duplicate the items to make permanent. 
Equip one of the items
you want to make permanent. There must be an unequipped version still in 
your inventory for this to
work. Use the "Duplicate items" trick again; however, drop the unequipped 
version of the item you
have equipped and want to make permanent. The equipped one and the others 
will drop and you will
never be able to equip that item again, but if you check your stats the 
items bonuses will be permanent.
You can duplicate anything that can be dropped, including Grand Soul Gems 
with Grand Souls
captured.