I have been struggling with my shipping on this shopping cart.  On some products it seems to overally charge and when I try and adjust it, it undercharges.  I only charge exact shipping plus $3.50 for the large boxes and $2.00 for the small boxes.  I have given numerous refunds on shipping overcharges.  If you think you are being overcharged on your order, please email me at rubes@countryrubes, or give me a call and I will figure out your exact cost.   Thank you for your understanding.  Janet