Walmart.com rolls back this Polk Audio SurroundBar SDA Instant Home Theater from $349.99 to $198. This is the lowest price we could find by $204. It adds surround sound to your home theater system in a compact unit. The SurroundBar is easily mountable above or below your TV, and it works wirelessly with the included subwoofer to enhance the entertainment experience with movies, sports, and video games. In-store pickup is free; otherwise shipping adds $4.97. Sales tax is charged in most states.