I found out about creativeexpress.com on another thread and thought I would post here...maybe I missed an earlier one already as I skimmed through....
Anyway they have many cartridges on sale for $27 each if you add 4 to your cart!!
As a brand new Cricut owner, this was a great way to start my cartridge collection....I got 5 carts for $145 including shipping!!
Now, if I can only figure out how to keep my SU CS from shredding in some spots...mainly small corners.