I go to Petcetera all the time. Bonuses: They have frozen mysis (not a great brand like PE, but it's decent), they have live ghost shrimp (for those hard to feed carnivores), live brine (good to get finicky fish to start eating until you can wean them onto mysids), and DTs live phytoplankton. Unless things have changed recently PetCo and Animal Kingdom (the one in south Davis) do NOT offer any of these. In addition, PetCo is where the Demon in control of inflicting pain and suffering on animals resides. Literally.
Petcetera has, I'll be honest, really janky SW tanks. They use airstone driven undergravel filters. However, if you need to get a particular fish you can ask Ron to special order it for you and pick it up still in the bag. He's good about getting it and calling promptly, and the price is always fair. It would be particularly important to QT said fish. Do not even bother trying to talk to Peggy about it, Ron's wife/co-owner, unless you are a regular customer. She's a crazy bat wench from hell to people who might even seem like newbies. Just wait until you see Ron, and keep away from the parrot.
ACE Hardware also carries some SW dry goods, although no livestock anymore. They are cheaper than Petcetera on things like salt and filters, and if you're putting together any kind of fish tank you're bound to have to cart your arse in there for some gear anyhow. Saves you a trip. There's a guy in the fish section named Doug with a goatee and long curly dark hair (about 40 or so) who can offer some great advice on plumbing, flow, etc., even on saltwater tanks.
HTH,
Juan.