Pet Smart is like the Wal Mart of pet stores. They sell overpriced "specialty" dogfoods, medicine, toys, hamsters, birds, fish, etc.. But as far as LFS, there's a surprisingly slim selection of shops around here. I located 4 shops that sell fish, 2 are owned by the same people and have the same (lacking) stock, one I called said "we have 1 tank with cichlids, we're not a big store", and the other is about an hours drive away. So basically Pet Smart and PetCo (both within 3-4 miles from my house) were my only workable options.
I did another water change Friday after work, and yesterday at the 24 hour mark (I also did a 12-ish hour test) and both tests showed 0 ppm nitrites and 0 ppm ammonia.
The water is also not becoming so milky, not that it was a huge problem, or that they're related, but typically even after 24 hours from a water change, the water would be noticeably milky, now it's hardly milky, even from looking through the side.
I don't understand how the fish got gutted either. It really looked like something was inside of the fish, ate all his intestines, and then chewed his way out.