I'd seen in Petco that they carried a little candy aquarium with this particularly filter included, so I emailed them to see if they'd eventually be carrying the filter by itself. Here's their response:
From: Britt Trozzi <BrittT@PETCO.com>
Subject: RE: Store Related Inquiries or Comments
Date: Sep 19, 2003 11:36 AM
Thank you for contacting PETCO! AZOO is distributed in the US by a company called "Red Sea" or "Aquaculture Technologies". Under this label, the filter is called the "Nano-filter" and should be in PETCO by Christmas. Please feel free to ask any associate in the store for more information!
Thank you for inquiring about this product; it's only through feedback like this that we can serve our most loyal customers like you!
Britt Trozzi
Customer Satisfaction Coordinator
PETCO Animal Supplies, Inc.