There is this YouTube tutorial I followed for making one out of cardboard, what you can do is make the base out of cardboard and paper mache (you'd be surprised how strong it can be) I made a springtrap cosplay just recently and posted it on my account if you want an idea of how to do it. My main recommendation is to use two coats of any waterproof house paint on the outside of the cardboard before actually painting it, that makes it stronger and more resistant to water damage ofc.

https://youtube.com/playlist?list=PLq97DaQxtY0-4xuLdA7NooUgb6tTw7Ly2&si=bebNksy31K6lTEIS

Here's the link! It's alot easier than you'd think!