Every Petsmart around me (in NC) only stocks the frozen Arctic Mice, but the Petco near me sells feeder mice. When mine were eating hoppers and weaned mice they never had them that size though they were always small and up. That being said I asked the manager which day they got their shipments and he said the guy who brought the mice came every Tuesday morning. You could call Petco and ask if they have feeder mice and if they do how small are they? If it's like the store near me you may be able to be there when they get them and pick the smallest ones they get. The manager even told me that they would often get hoppers in their shipment but he would reject them and they would go back.