Replacement bottom shell?

[pjc30943]

My W530 fell from the back of my truck while driving (the tailgate opened). Luckily I got it back, but one of the corners in the bottom shell is cracked. Are there any sources for just a bottom shell? Ebay doesn't seem to have them, and I'm sure Lenovo charge a lot.
I do have onsite warranty repair, but they don't cover accidental damage and I'd have to send the machine in to the depot...it's my work machine though so I can't send it in, nor do I want it out of my hands.