Check local grocery or convience stores for an old one they use outside and write on the back. Also we have coke and buffalo rock here locally so they give them unprinted for free you just have to call and ask. The grocery store might be able to get you one for free also.
Also you could use a drop cloth or cheap white shower liner from the dollar store.
Hope that helps!
__________________ Be who you are and say what you feel~ Those who mind don't matter and those who matter don't mind~
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