Bose is offering an additional 25% off refurbished headphones, earbuds, and portable speakers with the code SUMMER25. This stacks on top of existing discounts, leading to significant savings. Notable deals include the QuietComfort Ultra Headphones for $284.25 (a $165 discount) and the QuietComfort Ultra Earbuds for $186.75 (a $113 discount), both representing all-time low prices. These refurbished products offer a cost-effective way to acquire Bose's premium audio technology, including spatial audio and noise cancellation.