I think you're talking about the Algae Free Sureflow 1600 kits. It runs about $15 at marinedepot.

Got two myself and I can say it's a good upgrade. I have them on a wave timer, so they chatter a little bit on start up. But, that's pretty much the only complaint I have about them. Still not a Tunze Stream, but a good upgrade none the less.

Just FYI, I'd highly recommend you get the magnetic powerhead holders also. The standard MaxiJet suction cups don't last and the plastic mounts are flimsy.

Cory