Jellyfish generally need specialized tanks, more specifically a Kreisel tank. In these tanks, the flow of the water keeps jellyfish suspended, and the water enters and exits in a way so that the jellyfish are not tumbled or sucked in. I think the most commong jellyfsh that would be sold for aquarists would be Moon jellyfish, which require a constant supply of live planktonic food. I have seen a large mangrove style tank with jellyfish, but once again they are generally difficult to keep being that they are so delicate.
Squid/cuttlefish generally don't survive being transported well, and are probably best in the tank of an advanced hobbyist, or better, left in the ocean. Even if they survive, they tend not to live long, especially in captivity.