According to Digital MediaWire hardware sales were down 9%, to $498 million, while game software sales fell 6% to $616 million and game accessories sales dropped 3%, to $152.5 million.
The Nintendo Wii led hardware overall with sales of 687,000 units. The Microsoft Xbox 360 saw a boost from its recent price cut, and sold 347,200 units, while Sony's (NYSE: SNE) PlayStation 3 sold 232,400 units.
Among handhelds, Nintendo's DS sold 536,800 units compared to 238,100 for Sony's PSP.
LucasArts' "Star Wars: The Force Unleashed" was the top-selling game in September (1.16 million units).
Nintendo took second ("Wii Fit"), fourth ("Wii Mario Kart") and seventh ("Wii Play") places.
Also placing in the top ten were MTV/Electronic Arts' "Rock Band 2" (363,000 units); and Electronic Arts' "Mercenaries 2" and "Madden NFL 09."