In my area, there's only one store that carries them, but they usually have a tank packed with them. Talk to the employees, too. They might not be able to help you, but might be willing to refer you to the manager if/when they're in. Sometimes fish are common on the price lists they get from their distributor, but the store doesn't buy them often for whatever reason. If that's the case, it's easy to get some as a special order.