If you mean the lab style cages/tubs with wire tops comprising a food hopper and water bottle holder, I have bought them at a local reptile show used for $5 each for the shoebox size, they work well enough for 1.1 or 1.2 mice in each tub.
They also show up on Ebay occasionally, priced anywhere from 2.50 to 15.00 each. There are larger sizes occasionally as well.
If you want to buy brand new ones and pay a lot more money for them, BigAppleHerp.com sells them.
Or you could try your luck with a lab eqiuipent vendor, though they are pretty expensive new, A used dealer might have them for a decent price.
If they are for mice, make sure the bar spacing as small enough, like 1/4" or 3/8". Rat models have largr bar spacing and young mice could probably escape through them.
There are also plans for DIY racks using plastic tubs, like mortar mixing tubs, cat litter pans or sterilite tubs on various site. Sorry I appear to have lost the URL but a google search should find something.
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