What is a cheap and Strong way to make haunted House wall?

i need a cheap and strong idea for home haunt walls, im setting up a haunt this year and i need to find a way to have cheap strong walls! its not going to be very big its just for the neighborhood kids and i live in colorado so the weather here is crazy around this time especially more... windy and rainy windy and snowy hot windy day we have it all, it needs to be cheap like real cheap help!!!!!