Polk Audio via eBay offers its factory-refurbished Polk Audio Heritage Camden Square Portable Bluetooth Speaker
, model no. AM7220-A, for $69.99
with free shipping
. That's $20 under the lowest total price we could find for a new model. It features four full-range speakers, two passive radiators, 3.5mm auxiliary jack, Bluetooth 2.1, and up to 24 hours of play time. A 1-year Polk Audio warranty is provided.