^ Just be careful doing that, if the store carries rodents. Your rats can and probably will (if there's any at the store) contact any air-borne illness, which can often be found at pet stores. Outbreaks of SDA (deadly virus among rats) has often been traced back to petstores. I, personally, don't recommend doing it, due to the risk involved. URIs, mites and other such things can also be contacted if your rats visit a petshop with rodents on the premises.