If stores didn't sell anything but fish, the world would be a better place. But only good stores do that.
You can help by supporting stores that do not sell animals (if possible, financially and travelwise) or buying toys/food from the internet from companies that don't have a store selling pets somewhere.
Most pet stores that don't sell animals have animals from the SPCA or other rescue organizations there instead.
Those stores tend to make less profit in the end because they don't sell animals. What's more, they tend to know what they're talking about and are very helpful. They may be small, and you might get the same product from a big pet-selling store for a dollar or two less, but you're supporting them and keeping good people in business. People that actually care about their animals.
Never buy a pet from a bad pet store to 'rescue it'. You're just helping them make money. Some have said that petstores they worked at in the past purposefully kept the animals in bad conditions
because it increased sales. We shouldn't encourage that kind of business practice buy purchasing the animals. You can offer to take it off their hands- for free or a heavily discounted price. Keep in mind that petstores buy their animals super cheap- green ringnecks for ~$60 dollars or less from breeders (around here) and sell them for hundreds for big profit. But buying the poor bird/animal just helps them make more money and sell more animals. I'd rather they go out of business, don't you?
Of course, there are good pet stores out there selling animals, but they are far and few between. There are even breeders who won't make sure their clients are educated. As long as people are working strictly for the money, the animal will suffer.
It would be nice to see breeding regulated. Here you can buy a $30 dollar annual permit and breed as many birds as you want. It would be nice to see dog breeding regulated as well, but we know that won't happen unless the AKC steps in. Hah. (yeah... I don't really like the AKC, they encourage inbreeding and massive kennels producing way too many dogs a year- with AKC papers, of course. You know all you have to do to get AKC papers for your litter of pups is to send in information about the parents? What kind of regulation is that?!

)
So there's my little rant, lol.
And back on topic. Ahem.
We have a huge wild population of monk parakeets, nanday conures, and I've even seen a pair of blue-headed conures. After the hurricanes, I'm sure there are more species now, lol. Aviaries were destroyed and many birds were freed. I do believe that most of the wild birds were originally escapees, rather than released. Or I like to hope, at least. I know plenty are released into the wild, and the mutations get eaten for sure. There's a greater chance of monk keets surviving around here, since there are so many, lol. The nandays are in smaller flocks in select locations. It would be interesting if we needed permits for our birds. Right now, I believe we only need permits for native species and species threatened or endangered. And, of course, for any species regulated in any particular state (IRNs in Hawaii at least, Monks in many states- some states it's illegal to have a monk keet, illegal in Canada).
Of course, regulation can backfire. Smuggling and such is a gold mine.

Not too long ago there was a story in the paper about a man driving from Mexico with a hollowed out carseat full of chicks.