You asked this at the right season.
Go to your local walmart and look for these. They are 52 and a half inches long. The biggest tub made, period. They are used for putting fake christmas trees in and are only available at christmas time. They are called Iris VE175 Christmas Tree Boxes.
I recently bought a few myself and they are HUGE.
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Vision cages do require some investment but they work great. Good luck with your BCI.

