ORIGINAL: carrellh
I did find cheap, clear plastic, drop cloths on the paint aisle at Home Depot that work the same. I just cut what I need with a hobby knife. I think RCKen gave that suggestion.
That's what I use too, and find its very good. And for us frugal types (I think that might be e pre-requisite for this hobby

), is a great substitution for the plan protector.
-MA