If ya don't wanna wait for Marty to get his pumps in you can do a google search for a Aquatec 6800 or 8800. the 6800 is great for a few cages... if ya need more volume than go with the 8800 series pump. These pumps aren't normally sold with a power supply....... so the company always dings ya for the 15-25 dollars extra over the cost of the pump....... I suggest if you are handy you make your own power supply.... these pumps operate on 24VAC... so either buy a transformer and wire it up or find a wall-wart that puts out 24VAC with about 2-4amps output.
Google is your friend