Harman Kardon HKTS-18 5.1 Channel Speaker System: $483.49 (46% Off)

The normal price is $899, so this is $415.51 off. Very highly rated speakers.
200W amplifier power (RMS)
10" woofer, bass-reflex enclosure
8 ohm nominal impedence
3/4" dome, video-shielded tweeter
Dual 3" drivers, video-shielded