Is it best to just buy baby feeders and raise them up, or buy a few 'pets' from a petstore like petco?

I have a local reptile store i buy feeders from in emergencies, but one rat i intended to keep was covered in fleas or mites(not sure) and though i treated him for it, he died. So not a fan of getting rodents from there...

Is there certain qualities i need to look for when choosing mice?

Thanks for any help

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