Those arent for sale, they are in a big tank over the counter...or at least Im pretty sure they are not for sale. They look cool though.
I got my front for free...always wanted one, and my friend went to pickup a tank from a guy in madison and he was giving away all his fish with it. It was mixed cichlids and I got what would probably have been a $50-80 front around here.
Had him for a long time, actually bought another smaller one, but he got sucked into a filter uptake...like four months after having him. At that point I gave up the colony idea, and donated my other one to my lab.