For $100 You're better off making it yourself out of cardboard. Just make a cardboard set from pepakura templates. It's really easy just takes some time. Given that you're budget is $100, and you're asking somebody on the internet, I'd bet you're a (little) kid, so you've probably got tons of free time. Not hard, and all you need is a printer, britol board, and hot glue...lots of hot glue.