Hello Kelcam,
Thank you for posting in Microsot Community.
I am aware about the damage to your son's Surface Pro 8. Unfortunately, accidental damage is not covered under the standard warranty or the Microsoft Complete for Surface warranty. However, you may still be able to get it repaired through Microsoft's out-of-warranty service.
To get an estimate for the repair cost, I recommend visiting this page How much does out-of-warranty service cost for your Surface device or accessory? - United States - Microsoft Support. The cost will depend on the specific repair needed and your location. Keep in mind that out-of-warranty offers can vary by product and country.
To proceed with the repair, you may follow the instructions from this article Get service for your out of warranty or damaged Surface - Microsoft Support on how to process an online repair.
I hope this information helps!
Kind regards,
Lavenia