Harman Kardon via eBay offers the JBL Cinema 610 5.1 Home Theater System for $149.95 with free shipping. That's the lowest price we could find by $140. Features include:
8" bass reflex 60-watt powered subwoofer
4 voice-matched satellite speakers
dedicated center speaker
38Hz to 20kHz frequency response
While you wait for your money to arrive, consider these options for what to do with it.