You can find sharks at specialized marine retailers and reputable online shops. Most general pet stores carry freshwater "sharks," while saltwater species often require custom orders.
These are ideal for hobbyists who want the "shark look" without the 1,000-gallon requirement. Sharks & Stingrays For Sale - Saltwater Fish where can i buy a shark
: For rarer species or public aquarium-grade livestock, Shark Supply provides specific sharks but requires verification of your life-support system before a sale. You can find sharks at specialized marine retailers
The "shark" you choose depends entirely on your tank size and water type. True sharks are saltwater animals; freshwater "sharks" are actually members of the minnow family. Freshwater "Sharks" (True Fish) including bamboo and cat sharks.
: Sites like LiveAquaria and Discover Aquatics offer various saltwater species, including bamboo and cat sharks.