I've looked around on Ebay for that Aerus/Electrolux dust brush, but it's almost impossible to tell if what they're selling is a real one or aftermarket. If you have a link for a real one (preferably black, if possible), please share it.
Does Riccar sell a good one? Maybe I should have bought that when I bought a Sport Portable vacuum from Connie at the museum the other day (which arrived yesterday, thanks!).