The pet store is about 15 miles from my house, and by the time I get the mice home, they usually chew through the cardboard box. By the time I pay for the gas to get there and the mice themselves, I've already spent well over what I'd be paying if I were to buy 2 rats and the necessary supplies to breed them myself.

Do you think it'd be better in my situation if I bred mice instead of rats? My primary concern is that the rats will get too big too fast and my BP won't be able to eat them. Is it as easy to breed mice as it is to breed rats?