As an aquarium owner for many years, I have come to believe that it is impossible to find good fish stores anymore.
However, The Fish Store in Seattle is absolutely one of the BEST aquarium shops I've ever seen in my life.
They have a large selection of aquariums for sale and they're very inexpensive--I was able to get a 30g with hood and light for around $40, which is not a bad price.
Their fish stocks are just in great condition, and in all the years I've gone there, I've never seen a dead fish or even an ill fish in their tanks.
When you speak with the staff, it is obvious that they not only know alot about fish, but that they are genuinely concerned with their fish and take great measures to ensure that customers are buying the right fish for their tanks, and have the proper tank set-up and space needed for those fish.
Highly reccomended that you visit this store. They have fresh and salt-water varieties and the staff can answer nearly every question you pose to them.
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