Registered customers are assigned to discount groups based on total orders placed.
The more you purchase the greater your everyday discount.
Discounts are not compounded so compare your everyday discount vs coupon code discounts.
Your discounts are only visible when you are logged in, so be sure to login to see YOUR PERSONAL COST.
Prices shown when not logged in are Minimum Advertise Price(MAP), which are dictated by the Manufacturer of the products.