We got our first pair of furry children (aka dumbo rats) from Sailfin, and we couldn't be happier with our boys. Sailfin gets their rats locally, from one of several local breeders, and they are meticulously cared for (quarantined for a week before you can purchase them, kept in a warm room, separated by gender, only one litter for sale at a time so you don't see babies with their eyes barely open with adult rats, etc.), so we were able to buy brothers who had been together since birth. They are the happiest, sweetest rats in the world, and it was clear that they had plenty of human contact before they were brought to the store.
The fact that Sailfin doesn't ALWAYS have certain animals out pleases me as well. For example, I've been there when they haven't had any rats at all, because they were waiting on a litter from a breeder, and told me it would be a week or two. It's not like they have a room in the back full of attention-starved animals waiting to make it out into the main room to have a chance to be bought.
The selection of treats and toys are really amazing, and it's clear that the staff really know what they're doing, though once I saw rats picked up by their tails before, which is not a best practice for handling rats. It's really uncomfortable for them, and their tails can actually detach. Other than that, we're happy to continue shopping at Sailfin - happy employees and happy animals.