Message Hot Rod's Mom for a soft cone or kiss E-Cone-they're wonderful.
Here's her web site directly:
The Kiss-E Collar
She ships very very quickly in my experience, she totally understands a rush and it's just a necessicary item to have on hand.
Did they do internal stitches and coat the incision with liquid band aid?
You could also try a belly band with soft padding in it-change frequently to decrease the risk of infection.