Lenovo offers its Lenovo M0250 USB Stereo Speakers in Red, model no. 57Y6361, for $29.99. Coupon code "USP1OC246361" cuts it to $7.99. With free shipping, that ties our May mention and it's the lowest total price we could find by $8. This USB-powered speaker system features a 90Hz to 20kHz frequency response and a 3.5mm audio jack.