I had one of those moments of being pulled back a quarter century in life by a post form Peter Provost. Apparently, Brookstone is now selling an "EcoSphere" - Folks, it's more or less a sealed Sea Monkey tank. I can't believe that one could sell these for $65.
I suppose the nostalgia makes up some of the value, though. You can still buy the 'original' Sea Monkey gear at http://www.sea-monkeys.com/ (and I'm sure in the back of many magazines). Just in case you can't afford the Brookstone version.