If you want an idea to tide you over until you can get the plexiglass, I've been using a vinyl place mat over the top of the enclosures. I leave an inch or two uncovered, and using it vinyl side down holds the humidity in nicely. They're in a 10 gallon tanks with wire mesh covers. It's not pretty, but it gets the job done for me.
With the place mats and two whole house humidifiers, I only need to mist their enclosures a few times a week.
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