I got a broken large sheet of plex at my local Home Depot. I only cared that the unbroken peice was large enought to cut a square panel out of to divide my 55 gallon. I think I paid like $3 for it. You might ask if they have some broken or scratched plexiglass or acrylic sheets. Once in the tank, the scratches will disappear, but to the store.. the scratchs mean they most likely can't sell it and will give you a deep discount.
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~ Kayakbabe 
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