Amazon offers its Amazon Prime members the Altec Lansing USB Stereo Multimedia Speaker System, model no. BXR1220, for $11 with free shipping. (Non-members can spend $25 or more to qualify for free shipping; otherwise, shipping adds $8.87.) That's the lowest total price we could find by $8. These USB-powered speakers two 2" full-range drivers, built-in controls, a frequency response of 180Hz to 20kHz.

Amazon Prime membership is $79 per year; however, Prime is free for college students for six months, and free for parents and caregivers for three months. (Note that there is currently a wait for the Amazon Mom program.)