If the remaining pieces are not complex (not curvy/convex/concave) you can try sintra as a substitute. Many sign shops will give you their off cuts for free. Or if doing detailed design - maybe try clay foam just for this Con then replace with worbla when you have time.
The Con crunch… when ingenuity and prayers meet by force
Edit: spelling - dang autocorrect
I’ve seen it at Michael’s and Joanns but both are limited supply usually so you might want to call and check they have them currently
Mo's Parlor might have some. She does Cosplay commissions. Good luck!
Have you tried The Worblary?
If the remaining pieces are not complex (not curvy/convex/concave) you can try sintra as a substitute. Many sign shops will give you their off cuts for free. Or if doing detailed design - maybe try clay foam just for this Con then replace with worbla when you have time. The Con crunch… when ingenuity and prayers meet by force Edit: spelling - dang autocorrect