Unless you have Complete Care insurance, start with Out of Warranty support for a replacement estimate:
You might also want to get an estimate from a good local computer shop to compare the cost. The screen will run $100 or so; the labor, about that in most places.
Hi Tug Wilson,
These kind of accidental damages would only be covered under Complete care warranty.
If the computer has a complete care warranty, kindly private message the service tag so that I can take the case forward.
Click Here, then click "Send a Private Message".
If your computer does not have the Complete Care Warranty, you would need to contact our Expired Warranty Repairs team who can provide the pricing information for the LCD plastics: http://dell.to/14UCPMK (US based customers).
Awaiting your response!