Another option could be to build your own. I built a 5 tub rat rack like the one below for about $120.00 w/watering system. Houses 5.15 breeder rats and could probably hold 5.20, works great.

http://www.arbreptiles.com/cages/rat_rack/ratrack.shtml

I'm producing about 100-120 pups a month for a maintenance cost of about $12-$15/MO in food and Pine. Time in maintenance is about 30min a week. I'm in the process of building another 2 racks, the whole thing took 1hr to assemble as Lowes cut all the pieces for me.

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