I am in the same boat. I am building a combination mouse/rat breeding rack and wanted tubs the same size except for depth. A member on another forum I am on told me about this place: www.webstaurantstore.com.
The sell a bus tub that is 20x15x5. If you go to the site and click on the bus tub/box tab it will take you to what's available.
The above 5" deep one is actually just like the ARS 30, in fact that is a bus tub made by Table Craft!! They sell them in different colors, but the grey one in lots of 12 are only $3.10 each!!
They also sell a tub that is 21x15x7 which is good for rats. So I will be placing an order for my mouse and rat tubs shortly.
Hope this helps ya out.
Larry
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