Actually, scratch the shipping to other countries. My client has decided not to deal with anything outside the US.
Now my concern is the amount that the cart is charging for multiple items. It seems that it just adds a shipping fee based on weight - but doesn't compensate for quantity of items. In other words, if one item costs $10 to ship, if the customer chooses a quantity of two, it calculates $20 to ship, quantity of 3 - $30, etc. The cost of shipping the 3 items together is actually substantially less than 3 times one item. The system my client currently has calculates the same item with a quantity of one - $10, quantity two - $10.65, quantity 3 - 11.44, etc.
How do I program the cart to better calculate multiple items?