While pricey, here is an example (brand and model number) of a commercial scrubber I have not seen before.
http://cgi.ebay.com/AQUA-BREEZE-11-CHAMBER-SCRUBBER-AIR-CHAMBER-SUBMARINE_W0QQitemZ270383563292QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item3ef41dc21c#ht_500wt_1182
Steve McQueen
Indianapolis, IN