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Product Cost: includes the cost of the item, warranty costs, battery costs, etc.
Shipping Cost: Shipping Cost may be set by contract or estimated. Large items may have additional residential & lift gate charges added during configuration
Total Cost: Product Cost + Shipping Cost

Selling Price: This is the price that shows up on the website
Additional Shipping Charge: (this is the +shipping charge found on items like SLs, VPLs, & walk-in tubs)
Total Selling Price: Selling Price + Additional Shipping Charge