Electronic Express via eBay offers the Marshall Acton Wireless Bluetooth Speaker in Black for $129.99 with free shipping. That's a $10 drop from last week and the lowest price we could find by $69. It features 50Hz to 20kHz frequency response, bass and treble controls, and 3.5mm aux input.
Update: The price has dropped to $119.99.
Cut these features out of your phone plan to save money right now.