you can go to google and type in your city and also "aquarium" and you'll get a bunch of stores, and directions on how to get there.
internet sources are good; if you find a reputable site, but the downside is you can't actually see the fish you're about to buy. some ish have better color patterns, personalities, size than others. and you can't control that with the internet. and you have to pay alot for shipping.
a dovii would cost you $10 online; but the shipping rate would cost more than the fish itself.
a dovii at the store would also cost you $10; no shipping fee. well gas price but that won't matter much since you're bound to find a store close to you