ASP .NET - C# Decimal Comparison

A little more shopping cart hacking. Here's how do to Decimal comparisons in C#:

        public static decimal GetShippingCost()
        {
            decimal sum;
            decimal shippingCost;
            sum = GetSubtotal() - GetCouponDiscount();
            if (sum < 0)
                sum = 0;

            if ( Decimal.Compare(sum, 26.95m) <= 0 )
                shippingCost = 8.95m;
            else if ( Decimal.Compare(sum, 35.95m) <= 0 )
                shippingCost = 11.95m;
            else if ( Decimal.Compare(sum, 45.95m) <= 0 )
                shippingCost = 12.95m;
            else if ( Decimal .Compare(sum, 55.95m) <= 0 )
                shippingCost = 16.95m;
            else if ( Decimal.Compare(sum, 74.95m) <= 0 )
                shippingCost = 18.95m;
            else if ( Decimal.Compare(sum, 99.95m) <= 0 )
                shippingCost = 20.95m;
            else if ( Decimal.Compare(sum, 119.95m) <= 0 )
                shippingCost = 22.95m;
            else if (Decimal.Compare(sum, 139.95m) <= 0 )
                shippingCost = 24.95m;
            else if (Decimal.Compare (sum, 159.95m) <= 0 )
                shippingCost = 26.95m;
            else if (Decimal.Compare(sum, 199.95m) <= 0 )
                shippingCost = 29.95m;
            else if ( Decimal.Compare(sum, 249.95m ) <= 0 )
                shippingCost = 32.95m;
            else if (Decimal.Compare(sum, 299.95m) <= 0 )
                shippingCost = 34.95m;
            else
                shippingCost = 34.95m;

            return shippingCost;
        }