TheDeepDiscount via eBay offers the Acoustic Audio 5.1-Channel Home Theater System, model no. AA5103, for $79.99 with free shipping. That's a $20 overnight drop and the lowest total price we could find by $40. It features one 300-watt subwoofer, five 100-watt satellite speakers, Dolby Pro Logic, USB connectivity, and more. Deal ends March 2 at 12 pm ET.