I found someone selling male rats locally for $5 a piece so I picked up two of them. I then bought two hooded females from PetSmart. I added a dumbo female and albino female later on. Both of them I got from Petco. You may be able to find someone on the site that is close by and willing to give you a good price on a starter colony though. I've added new blood here and there but have also held back females from large litters. I'm now up to 7 tubs of 1.4 ratio.
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