If your seriously interested in shellies, do your research before buying as this will also help you recognize the fish you are interested in. As for the fish, some are rarer than others,just as they're aggresion levels are different. You may be able to find them at a lfs, but probably not at any chain stores. Check out the internet and buy fish from reputable dealers. Anyone in these forums can help you out with that. But,please, do your research and set your aquarium up to their needs before you buy your fish.