Hi! It looks to me like the shipping gets added in when you view the cart. I tested a plant and saw that $10 shipping you mentioned when I viewed the cart. Now, there are more than one "view cart" buttons, and the only one I could get to show me the cart was the one on the menu at the top. The one down the right side with a summary of what's in your cart didn't bring me to the correct screen, so you might have to use just that one at the top.
