How much does this cost to the nearest dollar?

Alpine Extreme Power Density Digital Amplifier
4 CHANNEL + MONO POWER AMPLIFIER 100 watts RMS x 4 + 500 watts RMS x 1 at 2 or 4 ohms Class-D amplifier design Alpine PDX-V9 5 Channel Power Density Digital Amplifier Power Rating 100W RMS x 4 + 500W RMS x 1 Stackable installation design with front-panel controls Quick-connect speaker connectors Dimensions 13 x 11 x 5 inches, Weight 7.04 pounds, model number Rank Electronics Car Multichannel Amplifiers 415, Is Discontinued Yes, Other display features Wireless, Color BLACK, Department Electronics > Car Electronics > Car Audio > Amplifiers > Multichannel Amplifiers, Manufacturer Alpine, Available April 19, 2012

Price is $820.00
Price: $819.95