Meritline offers this 2-Channel USB-Powered Stereo Speaker, model no. SP-1900G, for $10.99. Coupon code "MLCE03GN" cuts it to $5.99. With free shipping, that's the lowest total price we could find for any such magnetically shielded speakers by $7. They feature a frequency response of 100Hz to 20kHz and volume control/power switch. Coupon expires after the first 200 uses.