How do I make big Rice Crispy sculptures, 100% edible, and really cheap?

I tried this once, and made a trench out of the Rice Crispies. I melted marshmallows and butter to bind them together. The sculpture was decent size, but costed a lot.
Now, I need to make a large one, and have a tight budget.
What are some suggestions to make my dollar strech, make the sculpture large, and a cheap frosting that is easy to make in large sizes and also cheap
 
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