Wait... I'm confused, as far as I know, PETCO doesn't even SELL "feeder" mice.
At the PETCO by my place, they have signs all over the mouse tanks making it clear that these are NOT for food use.
I purchased the snake at this same store. I was told exactly how to feed it, what to feed it, etc. The tank had a chart of how many live mice it had already been fed.
I have had conversations with the staff when I bought mice there..."Oh, what kind of snake do you have? How old is it?" Etc, etc.
There are no such signs at this store.
Seems a little weird that they'd sell the animal, but not its food...??