Last year a company out in Richmond called Delta Aquatics closed down giving away all their unassembled tanks ( parts for 10,000 tanks ) of varying sizes from 2.5 gallon and up. I recall they had such plastic frames so if you are able to find the a comparable size and aquarium maker, yes they exist but to ship the unibody piece, it will be expensive. The other alternative is to make something similar out of plexiglass. Lots of second ends out there for cheap to make something that looks decent. You need a table saw, or router and methyl chloride of course. Plexiglass can be easily painted black if can't find black colour sheets. Try Industrial Plastics or craigslist as a start. 1/8" or less should be more than adequate as it is more for cosmetic than structural.
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