This week BestBuy.com has reduced the price on the Yamaha 5.1-channel Home Theater speaker system (model no. NS-SP7800PN ) from $599.99 to $319.9, which is a price cut of $280.  Even after the standard shipping fee of $53 this is still the lowest total price we have seen by about $106.  Sales tax applies for residents of most states. 
 

The Yamaha 5.1-channel Home Theater speaker system includes four two-way satellite speakers, one two-way center channel speaker, and a 130W slim subwoofer with 6-1/2" multi-range driver.  Features include a half-pipe port for smooth response during playback, FD-Bass technology, and removable speaker grills.  This speaker system is backed by a two year limited warranty on parts and labor from Yamaha.  Dimensions: (Height: Front: 41-3/16"; center: 3-11/16"; rear: 10"; subwoofer: 14-3/4"), (Width: Front: 3-11/16"; center: 10"; rear: 3-11/16"; subwoofer: 15-3/4") (Depth: Front: 4-3/4"; center: 4-3/4"; rear: 4-3/4"; subwoofer: 6-3/16"), (Weight: Front: 9.8 lbs.; center: 3.4 lbs.; rear: 3.5 lbs.; subwoofer: 19.8 lbs.)