Adorama offers two open-box Polk Audio S50 Tower Speakers bundled with two Polk Audio S15 Bookshelf Speakers, and a Polk Audio S35 Center Speaker for $549 with free shipping. That's $452 below the lowest price we could find for factory-sealed versions of these items purchased separately elsewhere. This set features a 33Hz to 40kHz frequency response.

Note that it's unclear what type of warranty is included.