I got this little girl from Petco.

The stores have absolutely no say in what their cages are like, how many animals are put together of what size/sex, or anything else like that.
Animals come in already scrawny & sick, and the retail outlet can't do anything about it. But to the people who say "all Petco animals are sick and dying!" Really?
That's funny, 'cause this guy came from Petco, too, and has all his toes & a full tail . . . He was nice & plump when I got him, and I've had no trouble with him at all.

The problem comes from the distributors, where they're kept in huge groups, and have no attention paid to them at all. But, you can find healthy animals there.