Polk Audio via eBay takes up to 83% off its factory-refurbished Polk Audio equipment, with prices starting from $29.99. Plus, all items bag free shipping. Depending on item type, a 6-month to 2-year Polk Audio warranty applies. A couple of best bets, with comparisons against buying new:

• Refurb Boom By Polk Audio Urchin Portable Speaker for $29.99 (low by $30)
• refurb Polk Audio 10" Powered 100W Subwoofer for $99.99 (pictured, low by $28)