They're commonly sold at Petsmart, Petco, and larger Walmart stores. However, they don't always have them in stock, so call around. You could also try purchasing some online. FYI, Atyopsis moluccensis is a social species, and do best in small groups. If you are serious about getting some, make sure that they are placed in a tank that is well established (~one year old), with a strong current of water. Filter feeders primary means of feeding is filtering out their food directly from the water column.