$30
Sells for $50 on Amazon where I purchased it and is one of the most popular speakers on the site (close to 5/5 stars with over 6,500 customer reviews). I have not used these speakers much so they are close to new condition, though the packaging box shows some signs of travel.
Link to Amazon site with more info: http://www.amazon.com/Cyber-Acoustics-Subwoofer-Frustration-CA-3602FFP/dp/B00BXF5HQ8/ref=dp_ob_title_def
Please do not message this poster about other commercial services.
This listing is no longer accepting messages.